Hmm...I am a ride coward. I can handle Big Thunder, Indy, and Star Tours just fine. Sometimes Big Thunder will make me feel a little funny in the head as will Star Tours if I sit in the back row and get thrown about too much. I have ridden Space several times but don't enjoy it all that much and felt pretty bad the last time I rode it a year ago. It doesn't make me want to throw up, but it makes me feel off-balance and slightly dizzy afterwards, about the way I feel when I'm realizing that I'm starting to feel the early warning signs of a migraine, but fortunately I didn't get the migraine. I have ridden Splash Mountain only once. As I expected, I didn't like the drop sensations, especially the final one, at all. One and done for me. I have never ridden Screamin' and don't intend to ride Incredicoaster. I had never ridden Tower of Terror, but nerved myself up at last to try Guardians.
So here's how it went... I actually went through the queue a few times on different days before I nerved myself to stick it out. By the third time or so waiting in line, I could tell that my heart rate was more under control and I had kind of reconciled myself to trying it out. I knew to expect multiple ups and downs and crazy drops and suspected I would not like that free fall sensation, but I really wanted to not chicken out just once. The ride itself was what I expected. It didn't set off my stomach but once again it bothered my head. I definitely do not enjoy that weightless feeling and felt like I was bracing myself the whole time in anticipation of each drop. It does distract from taking in what else is going on. After the ride, I again had that feeling of not being quite able to focus my eyes, a hint of dizziness and light-headedness, and a general feeling of blah. I recovered much quicker than from Space Mountain though; I'd say I was feeling fairly normal again after about half an hour. Since the after-effects weren't long-lasting and never too overwhelming, I was glad that I had tried it out just the once, but I won't be doing it again.