I'm finding this a very interesting discussion.
Pete posted a picture on his FB page of the inside atrium area of the RCL ship. When I looked at it, it didn't say "ship" to me, it said "concrete jungle". (Yes, I know they didn't use concrete - work with me here.) Still, I can see spending some time wandering around that area of the ship once I lose my money in the casino.

I just really appreciate the effort Disney has gone to so that their ships feel like ships. Apparently RCL is searching for the market of people who are worried about being cooped up on a ship.
Right now Val & I are pretty much in a
DCL mode (3 this year) but I've cruised on Carnival, RCL, NCL and Princess as well. I understand the appeal of them and am very tempted to cruise on one of them again. Especially as their price is usually lower than DCL for the same itinerary. In fact, we're planning an Alaska cruise next year and it will most likely be on Princess rather than DCL.