We went last year that time w/our 4 and 1.5 yr old DDs. That time of year is great..NO lines. Animal Kingdom both girls loved. We only spent a half day there, but went on rides, shows, etc. Epcot, we didnt spend as much time as we would have liked, but did spend 2 afternoons there. There are some rides for the 2yo, and just walking around the countries is fun. MGM...we're not going there this time. Just a personal preference. We did playhouse disney and the great movie ride last year. We did get to see some great characters, but my DDs wanted to do more rides then shows, and for that age, there really aren't many rides there. I would say 1/2 day at most at MGM.
