I am headed back to the Magic after a Dream B2B also. I most likely won't be back on the Dream any time soon. But we also had pros and cons. So people should read the pros and understand a lot of what the cons were was with comparing it to the Magic for me.
I felt the family pools on the Dream are just completely poorly designed and absolutely stupid with that many people on board. Waits for the AquaDuck are very long, but you can ride it on the morning and night with little wait, but I was disapointed with how cold the water was and how slow it was. I just didn't love it personally, so it's no longer a draw for me.
I also liked the Quiet Cove pool, but it has a lot of shade.
We absolutely loved the hot tubs on the Dream! Just loved them! We will miss them on the Magic.
We loved the Mid Ship Detective Agency and will sorely miss this.
My kids loved the clubs, but I found they spent less time in them than on the Magic - and I surmise, although they don't say this, that its because of the size and lack of personalized programming like on the Magic. But the technology blew away the classic ships... until the re-imagineering of the Magic.
We loved the public areas of the Dream and had a lot of fun walking around and exploring the ship - other than the pools. The bathrooms are phenomenal!
Remy was by far one of my favorite dining experiences on or off land!
But here's the big one that I totally agree with you on:
I really hated the feeling in the MDRs.
I felt crowded, the meals took forever, were very loud in every MDR, and my server team was very below par.
I was so looking forward to the Enchanted Garden - ended up really disliking this restaurant. It is jam packed! Just absolutely squished, the servers can't move around, and they are really harried in there.
AP I did like, but we got a table right at a big screen and it was fun - but again, we actually played cards at the table because this dinner was exceptionally slow! Like beyond belief slow! My kids didn't do the dine and dash as I like to call it here so they could see everything, but it was sooooo long to get the whole meal.
I also felt the crowds a lot on the Dream, but I had been on the Magic a lot prior to this cruise, so it was an adjustment.