We went two years ago and did Chef Mickey's, CRT and the breakfast thing at the Hollywood and Vine with Playhouse Disney (can't remember the name, sorry.).
We are planning a trip for April, and out of the ones we did last time, my oldest who is an 8 year old princess said she wanted to do Chef Mickey's again. Not CRT, Chef Mickey's. That seems to be the one everyone has talked about the most. Loved CRT, too, but they all seemed to enjoy Chef Mickey's the most. ETA: We will not do the breakfast with the Playhouse Disney characters again. The food was not good at all.
To give you hope, we are going in April and I just made ADRs yesterday. I was able to get everyone we wanted. I had to change the time on a couple of them, but I was still able to get them.