I seem to fall in the category that the majority of people fall in. Green doesn't bother me at all, but Orange can mess me up. I've been able to ride Green and the worst that happened was my legs were a little wobbly immediately after the ride for a couple of minutes (probably from nerves since my first time was on Green).
Orange, however, affected me for most of the day. We rode it first thing in the morning and I felt out of it and a bit woozy for hours afterward. The worst was definitely lift off, the simulator is much like those 'Gravitron' rides you see at other theme parks and carnivals where they spin you really fast and push you against the wall.
From what I can recall, after lift off, the Green & Orange are mostly the same? Someone correct me if I'm wrong.
I'm going in September and of course my boyfriend is insisting on riding Orange. I might sit out or listen to the others and keep my eyes open & focused straight ahead.