I've got a whole new level of sympathy for the handicap. One of the benefits of moving around on crutches.
Things you take for granted....changing trains, picking up a coin from the ground, opening a bathroom door, and so much more. Everything is just MUCH more difficult.
When I lived in NYC, I remember thinking how difficult the city is (no elevators in the subways, for example) for people who have trouble walking, but what I didn't know/think about was ALL of the other things that you need to do.
Another perspective enhancing experience.