I get motion sick at the drop of a hat (or ripple of the swimming pool, or turn of the parking lot tram...) AND I hate that dropping-feeling, so I don't ride Splash Mountain (I've ridden four times), Space Mountain, StarTours, ToT, RnRC, EE, MS, but I've walked through all of them. I keep DD company in line (even the single rider line) and then take the chicken exits. I don't worry about getting "trapped" into riding; I simply remind myself "DON'T SIT DOWN!" THat way I know I won't end up riding anything accidentally!
I can ride TestTrak and BTMRR... ONCE each, on each trip. That's my "thrill rides!"