Ah - the $1,000,000 question!
From my point of view, yes, moving here was the best thing we ever did.
However - both my husband and I are highly independent (we saw our family about three times a year when living in the UK), and very socially active. Since arriving in New Zealand, we have joined our local orchestra (and I am now the publicity officer on the committee), two sci-fi groups (my husband is vice-president of one), and I am goalkeeper for one of the ladies' teams of our local hockey club. I was also a member of our local tae-kwon do group until health issues forced me to leave.
I feel that taking part in social groups is a critical part of settling in. You need to be able to make friends outside of work, and, particularly if she isn't working (I have made a huge assumption here!!), your wife will also need to be able to get out of the house and away from the children on a regular basis - a lot of the people who I've come across who haven't settled properly are those who don't actually know anyone aside from their immediate neighbours! Doing things as a family, if you have similar interests also helps - local sports teams are excellent for this.
On the whole, I have found Kiwis to be incredible helpful and friendly, as long as you are prepared to meet them half way. (so, for an example, we don't actually *know* our neighbours since moving house, because we haven't made a huge amount of effort to go door knocking and to see them - we have just been far too busy!) I haven't met anyone who is deliberately unpleasant or racist (I do get the occasional good natured ribbing about being a foreigner, but it is not in any way intended to be mean or nasty).
Skype is a very good way of keeping in touch with friends and family, as is Facebook. We speak to, and thanks to Skype, see, each side of the family about once a week, which is actually more often than we did when we were in the UK!
You do need to be aware that things are not perfect here - please don't see NZ through rose-tinted spectacles. There are issues here, just as there are everywhere else. There are areas of massive deprivation, particularly amongst Maori, there is crime, and there are fatal car accidents. Politicians lie just as much as they do in the UK, and we even had our own expenses scandal at the same time as the "duck house" one in the UK - an MP put some porn on his work credit card, and then paid it back - the scandal was that he had done it at all, not that he had tried to hide it or refused to reimburse the tax payers! There is far less choice than there is in the UK - a population of 4.5m does not always support multiple versions of the same thing, so, for example, I like having tube-pasta once a week - I have the choice of shop's own brand or one brand name, and both in small-pack versions.
Having said that, I *adore* living here - I wouldn't go back to the UK now apart from for visits. I live in Upper Hutt, a city about 40 minutes drive / train ride north of Wellington. Within a short time, I can either be in the city, or over the hills in the Wairarapa, a huge wine growing region, I can be out by the sea at Porirua or Petone, and within a short walk from the house, I can either be by the Hutt River, or out in the hills. We have been able to afford our own house, with a garden, within two years of arriving here (and that includes the fact that we almost completely drained our savings moving out here).
I have a great job - one that I wasn't expecting when I moved here (the job that I'd come out here for, and was having my final interviews when I arrived then fell through a week or so before Christmas), which is going to lead to a full blown career, rather than just being something which pays the bills (I'm taking professional qualifications at the moment). My husband's job situation is a little bit more precarious - he's on a fixed term contract which will last until September, and he's then job hunting again. However, as I said in my post above, it isn't going to be critical if he is out of work for a few months, as we are able to set aside savings at the moment, so can pull ourselves back if need be.
One of the things that we said when we moved out here was that we had two years to get our indefinite resident's visas (I know the terminology has changes slightly since then...) - whatever happened, we were going to stick it out for the two years (unless we ran out of money completely - it took me three months to find a job, and we did actually have a countdown to when we'd have to buy our plane tickets back to the UK. That was mildly stressful...), so that we could then come and go as we pleased if we decided that we wanted to return to the UK. This helped us get through the occasional bad patch, because we knew we had an opt-out clause, and we also had to give it the two years to make a proper go of it. By the time the two years came around, last November, neither of us could even conceive of returning - New Zealand is our home now, and will be for the forseable future.
Again - possibly a bit more of an essay than you were expecting, but I hope it's given you a bit of a picture, and can help you see where we are coming from!