I had reservations about riding M:S, although I have not been sick from any other ride.
I was glad it was over when it was, but didn't suffer any ill effects form it. No headaches, upset stomach or anything. We went right over to Nine Dragons afterwards for dinner.

When we were exiting there were a few kids (not yet teens, and not little either) who were running to an exit. But I don't think it was because of being sick. It was just the kind of run you see many kids break out in from excess energy.
These same kids, stopped short when they started to run and complained of being dizzy. They sat on the bench, at a CM's urging. But the kids just seemed too antsy to sit still was all. (Acted hyper and were running ahead out of their parent's view anyway.)
I think just moving so suddenly and fast after getting off the ride affected them. But they didn't act sick in anyway.I was almost expecting people to be sick. But never saw anything like that. Just the opposite. Everyone seemed excited when they got off.
Just like ToT and RnRC, I think people sometimes work themselves up.
And rides effect everyone different. One of my sisters rides the teacups and CA Screamin', but can't handle drops like ToT and Mailboomer.