I think that it is a shame that more people
don't expect it! I had my 90 lb DS sit on my lap just about every trip to leave room for another person. I don't think my DH (44) sat down once on our last trip! The buses were always standing-room-only. He would never sit while a woman holding a baby or an older woman with a cane stood, no matter how tired he was!
I think that it is a real shame the number of grown men we saw who just sat when others obviously should have been given a seat. DH actually felt the need to speak to one man who had
his backpack on the seat next to him on an overcrowded bus! DH was

The guy was just clueless.
Probably the one and only fault I find with WDW is the terribly overcrowded buses: they are uncomfortable and unsafe!