gringotts and mummy are more dark ride than coaster--they do go fast but none of them have inversions (loops) or anything like that. gringotts is definitely doable if you're okay on thunder mountain, but the mummy can rattle you around a bit. it's somewhere in between thunder mountain and space mountain in terms of how jarring/intense it is. most of the scariness on both of those rides comes from the show scenes though, so give them a shot!
the big coasters at universal are rip ride rockit on the USF side and the hulk and dragon challenge (which is closing in about two weeks) on the IoA side, so be aware of that. flight of the hippogriff is in the same area as dragon challenge, but it's a much less intense coaster comparable to the barnstormer. some of the simulators can feel like a realistic coaster; the star tours-type ones are the simpsons, minions, shrek, and fallon. simpsons is actually a lot more intense than star tours, i feel... there are also tracked simulators that spin around and move on a flat surface, like the vehicles in toy story midway mania--that'd be transformers and spider man. forbidden journey uses a unique bench attached to an arm on a track that makes you feel like you're "flying"--it does lean you back heavily at one point, and people with motion sickness tend to have a bad time on it. if you're not sure, skip it
with that in mind i hope you try out some new rides and have fun!