We've done ...I lost count....9, 10....Disney cruises, and 2 with NCL. Our 3rd NCL aboard the Pearl is coming at the end of May to Alaska.
I haven't been on the Dawn, but I've been on the Sun and I think they're in the same category, but I could be wrong about that.
Anyway.....we wouldn't be taking our 3rd NCL cruise if we didn't like it.
You obviously won't see the Disney characters, or the Disney shows...but honestly, after my 4th cruise, I quit going to the Disney shows anyway. You can only see the same show so many times.
I like the variety of the shows on NCL. They usually have some great comedians, and I like the dance shows. They have all of the same other types of entertainment, like trivia games, wine tastings, art auctions....just a few examples.
The ships are just as clean as Disney, most of their crew members have stayed with the company for a long time and take great pride in "their" ship.
Even though the cost is extra, I like the choices for dining. The food in their main restaurants is very good, also. And I really like Freestyle Dining....when you want, where you want.
Some people complain about having to pay extra on the non-
DCL lines for things like a soda card (no drink station), but for the amount of money we've saved on those non-DCL cruises, we can buy a LOT of soda cards.
I'm trying to think really hard about where I notice the biggest difference between Disney and the others (we've also done Princess and Carnival) and one of the biggest and most noticeable is the port terminal. I think once you get past the "warehouse" style terminals the other lines have, you're pretty much in the clear.
Another thing that seems interesting to me is that the other ship's public areas don't seem nearly as noisy. I don't know why that is, unless it's because there aren't as many kids, but from what I've heard, there usually are the same amount on all ships at any given time as there are on Disney.
Well, okay....the pool area is ALWAYS noisy.
All the cruise lines have implemented restricted smoking areas, so that's not any different. I even have noticed that in the casinos it isn't very smoky, because I think less and less people ARE smoking nowadays.
Let's see....what did I miss? I don't know, I think you'll have a great time, if you let yourself.
If you have any specific questions, please feel free to send me a PM.