ajobbins: Passports are only 5 years, too.
NZ ones yes. But overseas ones, such as European ones are still 10 years, and many people will qualify for overseas ones with family. Personally I wouldn't get a NZ one if I had a choice to also get a euro one.
The problem with NZ having just 5 years, is that many countries now require passports to not be within 6-12 months of their expiry, otherwise you can't enter. So If you are going overseas a lot (say once every 3-6 months), you have to actually have to renew them every 4 - 4 and a half years.