There are heaps of them in New Zealand- I used to have a 1976 Mitsubishi Celeste, and it was built like a freaking tank. The fact it was built so solidly saved me and some friends from a 4WD which ran a red light, too. Most of the guys I knew at school at late '70s cars- Ford Escorts/Cortinas, Datsun 120Ys, Minis, VWs, Toyota Corollas/SR Coupes, and that sort of thing. (This was back in 1998/1999 or so, and the last time I was in NZ things didn’t seem to have changed appreciably).
You still see a few 1970s cars on the roads here in Australia- mainly Holden Kingswoods and Holden Toranas, but you get the odd Ford Falcon, Jaguar, or Mercedes-Benz as well. Morris Minors from the '40s and '50s are more common than you’d think as well, for some reason.
Old cars are more often encountered in Queensland because we don’t have annual Warrant of Fitness/Roadworthy checks; the only time a car gets a Roadworthy is when its sold.
As we all know, most of the older cars have appalling fuel efficiency, and so they’re starting to come off the roads now because with fuel at over $1.50 a litre it’s really not practical to be driving a 1976 HQ Kingswood around as an “Everyday” car.