I find that when I start to feel queasy that if I close my eyes I'm fine. That being said - our last trip we rode soarin' and I was fine. We had fast passes to do it again and I had heard that the best seats were row b1. Right in the center and no feet hanging in your face. Well I was a lot more queasier (is that a word?) in this row than any of the other times we have gone on this ride.
In short - I think it depends on the row you are in. If you feel sick just close your eyes for a minute and you should be fine.