Couldn't help but comment on this...we went 2 yrs ago and dd loved it at age 3. Again, this past April at age 5 she still loved it.
As a side note, when we went to AK in April..they also were doing a "Kid Kot" program with several stations throughout the park focusing on animals: survival, hunting/eating, habitat, behavior, etc. Great learning experience for those of you who barter with teachers insisting that a Disney trip IS an educational trip as well.
Again, my 5, soon to be 6, yr old dd loved these special areas/activities set aside just for her age group...personally made her feel special as well as having a fun time and chance to socialize with others within her age group. We will do this again if she desires.
Whatever you decide, it WILL be a magical trip!!!!! Enjoy!!!!!