I think the effects of this ride are way overhyped, as well. If you follow the directions, just about everyone does fine - there are very few that get ill on the ride in the big picture. I think it's incredible, and a cool experience to have - great technology. I have ridden several times, and I have never seen anyone ill, nor has anyone in our group been ill in anyway. I'm sure there are people that get ill, but I would guess that most of them don't follow directions - and then some are just more sensitive to the sensations.
Each person has to make their own decision. I went on it before all the talk about people getting scared and sick on it, so maybe that helped some - I wasn't nervous about it, just excited to get a chance to try it!
Hope others don't get scared of - Disney put a lot of time, money, and research into it - great attraction!