I'm able to ride all the rides at WDW w/o serious motion sickess. There are some (like Space Mountain) that I can only ride once a day. For some reason, when sitting at a booth at Garden Grill, where you are facing out from the center of the restaurant, I got really bad motion sickness. I think if was sitting on the side of the booth, and the front of my body was facing the direction of the motion, it would not have been an issue. Sitting sideways to the motion was bad news, even though it is moving so slowly.
The food was good, and my kids loved Chip and Dale, Farmer Mickey and Pluto, but I had to leave early and wait for them outside.