If you look in the disABILITIES FAQs thread near the top of this board (you can also use a link in my signature), you will find some helpful information in post #3.
The first thing is a link to the Disney website's Guidebook for Guests with Disabilities for each park. They recently re-formatted their site; it looks nice, but does have some formatting problems and duplication.
Post #3 of the disABILITIES FAQs thread also has some further information and links to past threads, specifically about epilepsy. WDW does not label any attractions as having warnings for epilepsy.
You can also look at the park maps for the attractions with warnings - they are marked with a red triangle on the map and also on a sign at the entrance to the queue.
For
Epcot here are the attractions with warnings:
- Mission Space (the green side is more 'tame' and the orange side is more wild. Both are pretty rough, but the Orange side has spinning in addition).
- Test Track
For
Magic Kingdom:
- Splash Mountain
- Big Thunder Mountain Railroad
- Tomorrowland Indy Speedway
- Space Mountain
- Goofy's Barnstormer (this doesn't have a triangle warning sign on the map, but does say that pregnant women should not ride, so it's not completely tame)
For
Disney Studio
- Star Tours
- Rock N Roller Coaster
- Tower of Terror
For
Animal Kingdom:
- Kilimanjaro Safari
- Kali River Rapids
- Expedition Everest
- Primeval Whirl
- Dinosaur
Soarin' doesn't have any 'roughness' warnings; just heights and possibly motion sickness.
The Safari and Kali River Rapids are listed because you can get unexpected hard bumps and drops during the course of the ride. Many people suggest that the Safari is less bumpy closer to the front, but it is still bumpy. We sit in the front seat because youngest DD needs to stay in her wheelchair; we still get bounced around a lot. It all depends on which ruts your ride car hits. I have also ridden it without DD, and have found the farther back seats are just as bumpy.