I grew up in New Zealand, and when I was a kid it was pretty normal to walk to school also. I spent my whole childhood walking 20-30 mins every morning and afternoon! Eventually I got a bike which saved a bit of time.
But now days, I think it's not as common. My nieces seem to get shuttled everywhere in their Mum's car. One issue is that there's a lot more cars on the roads now days so it doesn't feel as safe or as friendly for pedestrians as it used to.