The ride is very smooth, but will cause issues for some. I was in First Aid on Monday, and saw several people asking for Dramamine. Not sure if ALL of them were asking due to GOTG, but a mother daughter pair mentioned they had ridden it an hour previously and were still feeling off. I heard the CM offer meclezine but she said it’s better as a preventative rather than after. I made sure to take some before my ride on Tuesday and fared pretty well. There’s not full circles of spinning but there’s definitely spinning sideways, moving up and down, and dark areas where you don’t know which way you’re going to move.
Personally, I loved the ride and think it would be worth a little queasiness, but I might have thought differently if I had a really rough time. There were a few times that I made a point of looking for a point in the distance.
This is at least tied as my favorite ride in WDW (other is Flight of Passage) and has now beat out Rock n Rollercoaster as my favorite WDW thrill ride. On RNR, I always wait extra to get the front row, because the back feels super rough to me. We sat in the very back on GOTG and it was super smooth.
ETA: movement might be somewhat similar to Primeval Whirl (or Primeval Hurl), but not as bad. Not sure how close. I never tried to ride PW twice in a row, but I completely would have gone right back on GOTG if they had let us.