Well, I agree - 60lb for one bag is excessive. I already thought that without giving a thought to baggage handlers.
Anyway, I prefer to imagine it's all done by conveyor belts and robots and stuff. That's why I never get a window seat, in case I see something I don't want to see. :-/
I mean it goes away on a conveyor belt, and next time you see it, it's coming toward you on a belt. Out of sight, out of mind the rest of the time.