Although I agree that you start with a clean NZ Credit history, credit in NZ does not work the same as in the US or Canada. You can not build up positive credit in NZ, only negative, so having a credit card for the purpose of being seen as a good borrower is not as important here. NZ banks like to see a stable income and money flow before lending. I am in the process of getting a card just for convenience.
Cheers, Mark.
edit: spelling error.