There's another novel that's based in a large-scale theme park complex in Florida (though not Disney, because Disney World is referred to in the book as being something separate). It's a mystery book, though, and follows the head of security for the complex.
But for the life of me I can't remember the name of the book. I just remember that it was a British author, because some of the terminology used was distinctly british.
If you're just looking for something amusement park related, there's also "Thrill" bt Robert Byrne (I believe), which at one point was adapted into a horrible made-for-TV movie starring Antonio Sabato Jr. that threw physics and how coasters really operate out the window...
-Rob