I wouldn't necessarily draw any conclusions about our attitudes around this as children. I was exactly the same as you: I hated waiting for anything. Even waiting a few minutes in a grocery store checkout line with one of my parents was absolute torture.

As an adult, it's just not the same. Children's brains are not fully developed, and their desire for stimulus seems very different than an adult's. I think the closest I've come to experiencing this as an adult is in the early '00s. I didn't get my first smartphone until I was nearly 30. I suppose back then I didn't love waiting or being bored, but it wasn't an awful, terrible thing that I just had to fix all the time.

Nowadays I try to avoid filling the quiet times with my phone or some other stimulus. If I'm doing dishes or cleaning up around the house, I let it be quiet, and let my mind wander. If I'm on a train or a bus, I'll do my best to put away my phone and stare out the window, and get lost in my thoughts. If I'm in a waiting room at a doctor's office, I'll people-watch, or just close my eyes and think. It's really nice.