We just took our daughter at just shy of a year old. She LOVED the parades. They were her absolute favorite of the whole trip. And the Castle stage show (from the front row). She had no interest though in any of the other shows (Nemo, Beauty & the Beast, etc). Maybe because we weren't up close?
Also, meeting characters was a blast with her. After she got over her initial fear from the first few days (of the non-face characters), she loved to run up to all of them and "talk" to them and show them everything.