LeftRightCentre, the Disney ships are absolutely beautiful, and you don't need to be a Disney fan to go on them and appreciate them. There are actually a lot of adults who cruise Disney without kids, me included (I did start with my kids, but they're 19 and 20 now and I refuse to pay for them!).
They are gorgeous to look at, much prefer the classical shape of them to some of these huge great lumps in in the sea! The restaurants are lovely, the attention to detail is amazing. Yes they are Disney themed, but it is very subtle. Amazing customer service as you can expect from Disney. The only thing I wish they had was a buffet at dinner time, but other than that, they tick every box for me.
Saying that, the prices are now ridiculous - when I fist started cruising with them they were a lot cheaper, and we went on a special deal (cost me something ridiculous like £900 for me and 2 kids for a week from LA and around Mexico). The 14 night transatlantics used to be bargains until Disney clocked on that these were actually very popular with adult cruisers and massively hiked the prices.
I imagine our cruise in December will be the last Disney cruise unless prices get a bit more sensible.
I did enjoy our NCL cruise, although had several food incidents (am vegetarian, they seemed to find this massively hard to deal with. I was served pork in a specially ordered vegetarian dish one night :( ).
Looking forward to trying Celebrity next year.