I agree on the isolation. I lived in NZ. As someone from North America, it was strange how isolated it felt. Especially outside of Auckland. As for density, I disagree. Most of the country is empty but the cities are surprisingly dense by North American standards considering the population size.
I've never been to NZ but the data is utterly against that. The most dense city in NZ (Auckland) has 2418 people/km^2, and Christchurch is about half that. Wellington is 1918. [0]
By contrast every US city in this table [1] is way above that, with the lowest being 3889.4. (New Orleans, surprisingly, is a mere 783 [2].)
That's interesting. I wonder how they calculated the area. There's no way Yonkers is twice as dense as Auckland in a practical sense (I would guess it's similar). As for Wellington, there's a very limited amount of space to build on because of the topography. As a result, houses are small, streets are narrow, cars are small (I had a difficult time driving a tiny hatchback). The CBD is unusually big and dense for a city with a metro population smaller than Madison, Wisconsin. The airport is shoehorned in to the only flat space in the region. So why does it have a low density? I'm assuming undeveloped regions are being counted here. I suspect density in terms of "used space" is quite high. Totally anecdotal obviously.