This is such a fun thread I just have to jump in on it.
I was terrified by Alien Encounter before they changed it to Stitch's Great Escape (or whatever it's called now). I didn't want to go on it but my boyfriend at the time talked me into it, then laughed at me when I started crying because I was so terrified. Fortunately for me the ride's been change and he's no longer my boyfriend.
I also have an irrational fear of roaches that can provoke panic attacks so I won't set foot in It's Tough to Be a Bug. Said previous boyfriend tried to get me on that too, but after the fiasco at AE, I put my foot down.
I can ride Dinosaur! but it scares the bejeezus out of me. I'm with those other posters who said they've yet to make it to the end of the ride with their eyes open.
I'm a rollercoaster and thrill-ride junkie and I haven't had any problems with any of the coasters at Disney. I loved Mission Space and didn't experience any nausia on it whatsoever, but for some strange reason became sick on Spaceship Earth! The Tower of Terror is my favorite ride, so obviously that doesn't scare me much.
Another ride I won't ride again is the Teacups. It doesn't scare me but it will make me very, very sick.