Having lived in Europe, Australia, worked in US and Japan, I guess I have pretty unique experience with this.

Americans walk the least out of all, followed by Australians. When I visit the the US for work. People sometimes stop and asked me if I'm ok because I'm carrying my groceries home from the store. People would say: "What are you doing? do you need help?" lol

Virtually nowhere is designed for walking outside of say New York, parts of San Fran etc.