It took me many years to try most of the thrill rides at WDW. I'm just not a coaster person for starters, and beyond that, I don't like feeling terrified on a ride. I've never been to Universal because I know I would be too chicken to go on most of those rides. That said, I have since ridden: Splash Mountain, Tower of Terror, and Everest. It took me 15 years and 10 trips to work up the nerve to ride Splash, and I think 12 years and 7 trips to ride Tower of Terror. I enjoyed them all, although the backwards part of Everest still scares the daylights out of me. I've ridden Kali as well, but I found that lacking in thrill. Only thing it wasn't lacking was water!
I've ridden Star Tours and Body Wars as well, but don't consider them to be thrill rides. Test Track and Big Thunder MR have never bothered me, and I was never nervous to ride them. Love them both.
I refuse to go on Mission: Space and Rock 'n Roller Coaster because of my dislike of going upside down. I don't like things jumping out at me either, so no Dinosaur. And I'm not a fan of rides in total darkness, so I've never ridden Space Mountain. I would like to try that one though.