In 1999 my ds was then 6 months old. It was great. He loved the characters coming up to him. He liked to touch their hands/gloves & some of the characters we so sweet with him...once at CM's Goofy put his napkin on my ds when he was starting to fall asleep. He also liked being kissed by the princesses..I think he also liked all the colors & music. We took him on IASM, Peter Pan, & the carosel (in the seat, not a horse).
They have clean baby stations to change & feed them. And since they are in the carriage they can nap whenever they need too..we never had to go back to the room for napping.
I have alot of pictures of him smiling that trip was quite something for him as he suffered severe GI distress and colic as a baby.