When I was on the Magic last month, I rode the AquaDunk a lot. Before this cruise, I wasn't a big fan of this slide, but I've realized that it's actually really fun. I'm disappointed that the Wish isn't going to have an AquaDunk equivalent, but maybe the sixth or seventh ship will have one.
On my most recent cruise, I usually rode the AquaDunk in the evenings when the 5:45 dinner was happening. There was almost never a line, and when there was, there were only ever a few people ahead of me. The lifeguards operating the slide noticed how much I had been coming back up the slide, and sometimes they liked to mess with me.