Amazon warehouse workers routinely walk for 10 or 12 hours a day.

Hikers.

Restaurant workers.

Custodians.

Retail Workers.

Stay at Home parents do a surpriaing amount of walking and moving about.

Back in the day news reporters

Gophers.

Mail carriers

Tour guides

Vet techs/dog walkers

Lot of people walk daily. Perhaps you just don't get out enough to notice. Or, you just don't see any of those other people.