What are the thought of those of you who have experienced other cruise lines?
I cruise disney and
royal caribbean pretty regularly (every year) and have cruised norwegian and celebrity in the past. Of those three non-disney lines, i think royal is closest to disney in terms of overall feel, onboard activities, fellow cruisers, etc. celebrity was gorgeous and classy but we were bored (were in our mid-30s last celebrity cruise and entertainment is definitely geared toward those twice our age, and everything shut down early); norwegian, on the other hand, felt a little tacky and like a step down (though we were on an older ship, the gem, and i'm curious to try one of the newer bigger ones like the breakaway and getaway).
i do think disney has the best overall service of any of the 4 lines i've been on - you rarely hear "no" from them. that said, our MDR servers on royal have consistently been better than disney, and royal service is still way better than you normally find in a hotel or restaurant on land. food is fairly equivalent - i'd give royal the edge in the MDR, disney the edge in the buffet and specialty dining. both have good evening entertainment, but i actually prefer royal's - depending on the ship, they have broadway-style shows (mamma mia, hairspray), cirque du soleil style shows, and diving/water shows. i don't go to things like the "bellyflop contest" which i think is what Disney Fantasy was referencing above, but there's still plenty of stuff to do - i find myself way busier on royal than disney (though always take time on either line to kick back on the balcony and read a book

).
i dont get the nickle and diming comments about royal, either. that said, i DID feel nickle and dimed on norwegian, but there are specific reasons why - to get a snack at their coffee bar you had to pay for a coffee (disney and royal both offer free snacks at their coffee bars), and the MDR food on norwegian was so horrible we had to pay for dinner at specialty restaurants every night just to get something edible.
not knowing things like your demographics (age etc) and where you want to go, it's hard to make specific recommendations. that said, you won't know until you try. it sounds like you're more interested in getting to certain ports, so my two cents would be to choose a cruise that goes there, and try a new line if you have to. fwiw, i resisted trying royal because my
travel agent said it would be a step down from celebrity, only finally went on royal because some friends dragged us on with them, and it ended up being my favorite line. so, you never know!