This was our least interesting park with a 3-year old. She was scared of Indiana Jones and the Great Movie ride, and she enjoyed TSMM but was too little to actually play the game. So you have backlot tour, meet and greets, and the shows (LMA, Little Mermaid, Beauty & the Beast, Muppets). It filled a day, but the other 3 parks were much more interesting.
I'm looking forward to going back next year when she's tall enough for Star Tours!