If you are looking for "thrills", let me suggest the Universal Parks. My kids were Disney fanatics until they were about 10...then they grew up. They now know the ins and outs of the Universal parks just like we used to know Disney. They especially like the Spiderman ride there, plus you get to see the amazing Harry Potter lands. From a cleanliness and service standpoint I find Disney and Universal parks to be of equal quality. Of course, you won't get your photo with Mickey Mouse, but they've got some neat character experiences at Universal (the Minions are great and the Transformers are amazing).
Personally I like the laid back/casual pace of Disney World so I look forward to when my kids get old and are again interested in Disney.
Enjoy your trip to Orlando.