I'm a certified ride chicken and don't ride rollercoasters. Having said that I'll go on everything in US except the new rollercoaster, Rip Ride Rockit and the only things in IOA that I won't ride are the Hulk, Dueling Dragons, Dr. Doom and Storm Force Acceleration (tea cup kinda ride - can't do the spinning). I also have to close my eyes on the "down" part of Spiderman, but overall its one of my favorites.
My kids are teens and absolutely love US/IOA. They never want to go back to WDW anymore since we've been there.