We are avid cruisers and DVC members (and LOVE DISNEY).... but
DCL was a one and done for us!
We cruise RCCL, CCL, and NCL pretty regularly and have tried Celebrity once as well. We took NCL to Alaska 3 summers ago and chose it because it went to Glacier Bay, was a one way cruise from Vancouver (so we could extend our trip by a week afterward in Alaska) and because it was $10,000 cheaper than DCL. Yes that's right....$10,000 CHEAPER. (And on DCL we would have been cruising in connecting cabins with a window vs connecting cabins with balconies). We are a family of 5 (now 8 year old, 14 year old, and 16 year old). I finally bit the bullet and tried DCL for a Caribbean cruise in October 2019 because it was only $4000 more than RCCL or CCL. And all the people we knew that cruised Disney said it's the best and we'd never go back to other cruise lines. Unfortunately, we discovered that they've never tried other cruise lines (and many of them weren't actually paying for their cruises - their parents/grandparents were taking them and paying for them) - hence, the extra cost didn't matter to them!
Disney is GREAT for parents of toddlers and small children - in fact, they may not want to leave the kids clubs on DCL. My husband and I work quite a bit so we really want to spend time with our kids on vacations. (But for all you stay at home parents - you may need a break from your kids because you see them all day, every day....this could be a perk for some families!) However, on all other cruise lines, when I went to pick up my daughter from kids club - all of the staff knew who she was and went to get her. On DCL, they made me GO FIND HER among 200 other children in a giant kids club. They don't know your children at all on DCL. One night it took me nearly 15 minutes to find her and I almost had a meltdown because no one would help me find her. That kids club is HUGE on DCL. They told me "she's in this area" based on her GPS location. I finally found her and I was pretty upset by then.
Food: We all found the food to be very bland on DCL and voted it 5th (last) out of all of the other cruise lines we've tried (Celebrity won top awards for food). They also put all 5 of us at a table for 4 at the restaurants on DCL (we usually sit at a large table for 6 on other cruise lines). This made dinner cramped and uncomfortable when they just threw a chair at the end. The dining rooms were also so loud on DCL (with such a loud roar that we had difficulty hearing out youngest child across the table). What can I say....hundreds of small children are loud. And although I LOVE KIDS, I found the amount of kids on DCL was WAY too much for us. They seemed to outnumber the adults in almost every area. RCCL and CCL have great food (but Carnival wins by far for best pool side food- you don't get poolside food on RCCL). I dream about Guy's Burger Bar at night....
Cabins: The shower ceiling was only about 5'10" tall on DCL (so my husband's head brushed the ceiling while in the shower). For all of you tall guys and girls, you'll have to stoop in the shower. The cabins on DCL were nice but since we usually cruise in Junior Suites on RCCL (for a much lower price) they were inferior to what we are used to.
Pools:/Water areas: Way better on most other cruise lines. Other cruise lines have giant splash pads, multiple pools, and multiple water slides. DCL had one slide with a 2-4 hour line. (We only rode it once because we waited 2 hours in line on a port day). On other cruise lines the wait times for a slide are 5-10 minutes most days. Maybe 20 minutes on a sea day because they have multiple slides.
Daytime Activity: RCCL has the most to do during sea days so this is our favorite for daytime activity. They have shows during the day, water activities, escape rooms, 3D movies, zip lining, rock climbing, boogie boarding/surfing simulators, ice skating, etc. You can't even do it all in a week! We were bored on sea days on DCL because character meet and greets can only entertain you so far.
Entertainment: For us, the shows are so much better on other cruise lines, but I prefer adult shows, adult comedy, etc. We walked out of shows 3 times on DCL which is unusual for us. They weren't bad, they were just geared for 5 year olds. (And I'm not offended by adult content, raunchy comedy....I find it hilarious). The Aqua Theater shows on the Oasis Class RCCL ships are AMAZING and so are their stage shows. Carnival theater shows can sometimes be mediocre but they clearly spend their money on comedians, so if you like comedy shows, CCL is the best for this. The stage shows on other lines are wonderful as well. I'm not a gambler but there are casinos on other lines if you're into that. Just beware the smoke....
Nightlife: I found the nightlife to be non-existent on DCL. (Maybe lots of parents of young children were going to be early). The bars were almost empty on DCL. It was so odd. The bars are HOPPING on CCL - until the wee hours. We love to bar hop in the evening on CCL. If you love to dance, CCL is the best for that - people are DANCING at the parties!
Drinks: CCL wins this hands down. They make the best darn cocktails! We usually get the full beverage package so we can try out new drinks (and since we don't have to drive anywhere) and this always makes it a lot of fun for us. For those who don't like to be around adults drinking, this could be a deal breaker. CCL also includes specialty coffees with this package so we like this in the mornings.
Staff: DCL wins this by far! They just go out of their way to please you. However, our staff has always been great on other cruise lines and we haven't had a terrible experience with any of them.
Private Island: They all look the same to me. I didn't find DCL's island to be better than CCL or RCCL's (or NCL's) ....however, Cococay may blow these all away (we haven't been there yet.
My advice: Try DCL once! You may find it's worth the money for you! And it may fit your family perfectly! You might want to try a shorter cruise or Caribbean cruise which would be less than the Alaskan cruise. Although we can easily afford DCL, I didn't find the value to be there for me since I found it to be a similar product to other lines. And for my older kids, there was much more to do for them on other cruise lines. Good luck!