I skipped through this thread, but has she ever even attempted to go to Disney (as an adult)? I mean if she's never tried it and refuses to go that's just messed up. I mean a free trip to spend time with you and she won't go?
If she's gone and hates it then there's nothing you can do. However, if she even refuses to try it, that's just silly. This isn't some life changing thing, it's a trip to Disney. If my gf likes to do something that I don't like, then the least I can do is try it and see if I'd like doing it too.
Luckily, my gf is a Disney lover (she converted me). Although I think my love for the parks has surpassed hers.. although she had been going to WDW for every vacation from since she was like 6 til last year (something like 14 years straight), haha.
Personally, I think if it's something that you truly love, then it should be an issue if she can't even tolerate it. If she rips on you every time you go then that's an issue. As I said, it's one thing to tolerate it and just go along with it, and another thing to give you crap about something you are passionate about.