I also didn't like the ride... made be feel really bad and sick for the rest of the day... but my son rode it twice...
The most nauseating thing you can do on a centrifuge ride is to turn your head from side while experiencing G forces. It messes with your inner ear and, basically, induces sea-sickness.
I took my kids on a centrifuge at Six Flags that I'd ridden several times with no ill effects. On that ride, I placed one kid on either side of me, and kept turning to the side to check on them. I was messed up (nauseated -- big time) for nearly an hour. (The kids were fine...)