I would avoid the Dinosaur ride at AK. There were a lot of strobe effects on that one. Surprisingly, Space Mtn was not really bad. There was the one tunnel with lights, but they were not strobe-type flashing lights.
There are a couple of very good threads in the FAQ post for this board that discuss epilepsy.
We had a great trip, and the only seizure ds had was not in the parks at all, but in our villa prior to breakfast one morning.
Flashing lights are important info not just for epileptics but people with migraines for example. I would sit in a chat and when people had flashing avatars I got sick and headaches. I would have to scroll the page down for a while then read the new stuff or tape over the area on the screen where the flashing avatar was. I do not get migraine or have epilepsy but give me a flashing avatar and I am knocked for a loop.