(1) The teacups. I get queasy just watching them. I understand there are maniacs who not only do this ride but spin the wheel as fast as they can to superspin, and indeed that there's one cup in particular that is supposed to be the megasuperspinner.
(2) Space Mountain. After riding it, my wife was so barfed out that she had to go back to the hotel. I came through it OK, except that in the dark I couldn't ancitipate the turns, so got outer-space-whiplash.
(3) Thunder Mountain RR: After she went back to the hotel, I did TMRR, which barfed me out so that I had to go back to the hotel too.
(4) I finally got the nerve to to Flash, er, Splash Mountain, but sat on the hard seat so that my tailbone resonated like a tuning fork when the logboat hit the bottom of the big drop. Limped around for the next two weeks. I'd do it again, but only sitting very carefully!
No problem with the elevators in the Hollywood Tower Hotel, though I wouldn't recommend them right after lunch. Survived the Temple of Mara so far, but I do wish that just once someone in the transport wouldn't look at Mara so that we could all leave with armloads of gold & jewels instead of ... snakes, why did it have to be snakes!?