I haven't been yet, leaving from NY on 9/28, but we are also planning to go to the Magic Kingdom ourselves (first time being there without children lol). Anyways, the ncl web site has down 1 hour each way for the shuttle to the MK.
I think your 5 1/2 year old will just love it!!! Don't forget to take him on the Pirates of the Carib. ride, espically since the release of the new disney movie . And of course "Its a small World" is not to be missed!