Hah I took my Miroir Speedy (and I've taken others like my BH and Damier Speedy) to Disneyland. But one major thing was that I was with my parents. I go on maybe ONE ride with them there since they're not into rides. The ride we went on was Pirates, but I had asked for a big plastic bag at one of the stores there and put my bag in it when we went on the ride. There wasn't even much water anyway.
When I'm with my friends though, it's a different story..then I take my Damier Speedy. Nothing to worry about there.