GPS was life-changing. (Yes, I am that old.) It used to be necessary to find printed maps of wherever you were going, which wasn’t always easy. Then you had to figure out a route. The hardest part was often the last bit of the trip, since you weren’t likely to have a detailed map of your destination city. An if you got lost, figuring out where you were was sometimes quite difficult.
People tend to think of it as mostly affecting longer trips, but finding new addresses in a city was at least as much of an issue. When I lived in the bay area I had a Thomas guide that was 3/4" of an inch thick, just for finding my way around town.
I gather that to get a London cab license you have to pass a test that requires you to know pretty much every street, alley, and major building in the city. I can’t imagine how long it would take to get all of that into your head.