We are a couple (40yrs old) without children. We cruised with Disney last December. We had a good time, but probably will not cruise with them again. I agree with all of the positives that were mentioned. Their shows were awesome. We liked Palo's. We also liked the adults area, but we felt the cruise lacked something and we had a hard time putting our finger on it. The rotational dining was good, but not great. We feel like the spa areas on RCL's ships are far better. In fact...some of the treatment rooms on the Wonder are directly under the sports deck and you could hear folks playing basketball.
We get a kick out of some the standard cruise things like the belly flop contest etc and our cruise on the Wonder had none of that.
Disney really caters to the family which is great, but we walked off the ship feeling like we needed to hurry and book another cruise to fill that empty feeling. DCL's current ships are a bit smaller (less that 80,000 tons) and we sort of felt the size even though I really can't explain what that means.
For the price...we will now look for other cruises other than Disney.