This was my experienceI have a friend who is worried about his motion sickness (he doesn't ride joker or houdini because of it) so I def get why the spinning aspect might be a turn off for some people. I have heard that most people don't feel anymore sick after Time Traveler or Ride to Happiness than any other coaster so hopefully its not that big a deal.
Flat rides can really screw me up after a ride or two, but lapping Time Traveler or Ride to Happiness didn't give me any problems at all. I think the rate of rotation is way lower than you'd expect, to the point where I'd more call it drifting than spinning, but obviously that doesn't sound as good for promotional materials. I'd say if you've ridden Cosmic Rewind at Epcot and enjoyed it then an Extreme Spinner would be well within your wheelhouse!