My kids liked the Honey I shrunk the Kids playground at MGM/Disney Studios bettter than the Boneyard, until oldest daughter found the sandy area at the Boneyard where you can dig up the huge fake fossil.
I think it depends a bit on the age of the child as well. DS was 3 last time we were there and LOVED the Boneyard. HISTK was a bit too big for him - and I was nervous because I couldn't keep as close an eye on him as I would have liked. The resort jungle gym was another hit (go figure!).