Our biggest disappointment that Disney could have done something about was the overcrowding on the busses. They had standing room only at least half of the time, it seemed. I realize a lot of people go to the parks at opening and leave at closing, but it still seemed like they should be able to handle the volume better, especially considering that the time we were there wasn't that crowded overall compared to the busy times of year.
Our biggest disappointments that Disney couldn't have done anything about were a) the constant rain and b) rude people. My two worst ones: at one point, I found a park ticket on the floor of a restaurant, and after asking around at the nearby tables, turned it in to a CM... and just as I turned to leave, I heard a woman sitting in the same area saying loudly, "I have no idea where it went. I can't find it anywhere." So I walked up to her and said, "Excuse me, but what did you lose? I just found a lost park ticket, was that it?" She practically bit my head off telling me emphatically that she was NOT talking to me, she was TRYING to talk to her husband, and it was NOT a park ticket she lost, and get out of her face! Sheesh, I was just trying to help.

And then on a different day, a woman kept edging closer and closer to us while waiting for a parade, and my 2 yr old DS inadvertently lost his balance and stepped on her toes (she was wearing flipflops.) He immediately apologized, as did I. I expected that to be the end of it, but she went on to lecture him, going on and on and on until he was nearly in tears. I picked him up to comfort him and told her that he had apologized, and to leave him alone, at which point she glared at me icily, remarked to everyone in the vicinity how it's no wonder children are rude when they have rude parents, and stalked off. DS was upset about it right up until the parade distracted him
Mostly, though, our trip was great. The bad experiences are so memorable just because they just seemed so out of place when everyone else was so pleasant and friendly and having so much fun.