I'm huge fan of the mouse, Annual Pass holder and a frequent drinker of the mickey kool-aid. I've done DCL 2x.
The 1st time I took my mom and DD. She was about was 3 or 4. I loved it. The kids club was fantastic and I felt comfortable leaving DD there. Which means mama got some much needed alone time. It felt like a real vacation for me. Don't judge me. DD loved it too. She complained upon pickups often, lol. Worth the Cost
2nd time was a multi generational trip and DD was around 9 or 10. She liked it but wasn't as in love as the first trip. The princess thing was fading and she preferred hanging with us. From and adult perspective, my major gripe was the ship shut down early. DH and I aren't party animals by any means but it would have been nice to have some late night entertainment. A open bar, some live music a dj somewhere, anything! I didn't notice this on the 1st cruise. But the 2nd time we had family our age group with shared interest. We either had to create our own late night fun or just turn in early. I don't recall much activity of interest after 11pm on any day. Not Worth the cost
I sailed the Wonder and Dream. Ship was immaculate both times. Dining was good. MDR experiences were fun. Palo was superb on both ships. Fireworks....... Worth the cost
TL:DR Now I've also sailed NCL and Carnival a few times each. And I can honestly say when I'm looking at cruise prices, I never look at Disney. At this point DD is older and for us the cost is no longer justified. But If you're itching to try DCL, absolutely go for it. You won't regret it.