Get rid of her. As someone with education in the psychological arts, you should realize something must be seriously wrong with her to not like Disney! Maybe her older siblings used to beat up on her while she watched The Mickey Mouse Club as a child. I suggest shock therapy. And probably lots of drugs.
KIDDING (please!)
Oddly enough, *I'M* the "practical, serious, all-business, left brained" one in our relationship. My fiance is the "free spirit, roll-with-the-punches, right brained" one. Although we both love Disney, it's the ONLY time I truly feel comfortable just letting go and being a kid. No one knows me down there, I don't have to keep up appearances. I'm not "the boss", I'm just a big kid. Seriously, I run from attraction to attraction! I love interacting with the characters! When I'm there, I leave all my stress, all my troubles, all my "adult life" (that kind of sounds dirty, doesn't it?) behind. Stinks when I have to come home, but for that week or so, I can just be a kid again, with no responsibilities, no stress, no deadlines. And when my fiance gets tired (or embarassed) of my behavior, she goes back, relaxes by the pool, or goes to the spa, or does one of those other "grown-up" things while I do my thing. What really sold her, (she used to think Disney was "just for kids", too) was the Food & Wine Festival. She "makes" us go back for that every year, now!
Maybe on your next trip. make it a special "grown up" Disney trip. Focus on the dining, do a fireworks cruise, play some golf, relax at a spa, pool hop, scuba dive in The Living Seas, do a "behind the scenes" tour, see Cirque de Soleil, etc, etc, etc. And maybe when she's all relaxed, lounging in the jacuzzi, tell her you have to make an important phone call and sneak over to Pirates of the Caribbean for a quickie!