I have this problem, too!!
Tower of Terror bothers me a little bit, but it's worth trying at least once. The two most bothersome in this area are the two simulators: Body Wars at EPCOT and Star Tours at the Studios. Space Mountain and Rock'N Roller Coaster can also give me that queasy feeling. The theater-in-the-round presentations at China and Canada can also make me feel a little off, but you can always look at the floor if you have to !!
But, if you've never tried Meclizine, give it a try. It's the same medication that's in Bonine, but you can buy it in large bottles at Wal-Mart for a fraction of the cost. You don't need a prescription and it really works well . . . won't make you drowsy, either!!
Whatever you decide to try . . . . . have fun!!