We took Gwendolyn to Disney Magic Kingdom while we were in Florida this week. She... tolerated it for the most part. We will definitely go again, but in about 4 years. There is really no point taking a toddler to a $75 theme park. Her favorite thing was the slide in one of the playground areas, and we could have done that for free at any McDonald's. She did enjoy Its a Small World and the holiday Parade.
Side note: next time, we are NOT going during a holiday week. The place was packed. I would much rather go in January when the majority of kids are back to school.