Me and my boy returned to NZ about a year ago now from a couple of years in the UK. Didn't feel ready to leave and it was a shock to the system going back to NZ, had a couple of panic attacks at the thought of seeing old friends which was a bit strange.
Anyway, within 2 weeks of being back we knew that it wasn't where we wanted to be, so we treated it as a summer holiday, caught up with family and friends and saved up to move to Melbourne.
Been in Melbourne for almost 4 months now and haven't looked back. I can't ever see myself returning to NZ live, its just way too small, weather isn't as good as OZ, more opportunity here, better salaries etc. As Mutant said, OZ is definately the best of both worlds (well Melbourne is, haven't yet checked out the other cities) you have the big city feel, fantastic public transport, loads to do, so many bars, clubs, pubs and restaurants, but you also have the friendlyness and culture and a better quality of life that you dont get when you are living in the UK. Also being able to own a car again is great!
Everyone is different and want different things from life, I thought I was going to love being back in NZ but I was very wrong. I think once you get out there and start travelling then you definately get a taste for it and want to see more of the world. I cant wait to start exploring OZ, there is so much of this country and people often overlook it and head onto the UK and Europe.
Good luck with the trip back home Ravingmad, hope it all works out for ya.