We've been to Alaska 3 times. Once on the Wonder and twice on Princess. We have enjoyed all 3. In fact, that Wonder cruise, which was a DVC Member Cruise back in 2015 (or the 9-night Greek Isles on the Magic cruise last year - it's close) may be our favorite cruise we've ever taken. I think that the biggest pro for the
Disney Cruise is actually the fact that it round-trips out of Vancouver. That means that you will get the entire inside passage, including the area between Vancouver Island and the Canadian Mainland. Makes for some absolutely beautiful sailing. That said, as others have stated, other lines are going to be much more affordable, but most are going to go out of Seattle and you'll go around the west side of Vancouver Island.
Our Princess cruises were definitely not Disney cruises, but we very much enjoyed them. If you look at another line, you will need to look at your situation and see what is important for you. We love Princess as well as
DCL, but then again, we don't need Zip Lines or Go-Kart tracks. We'd rather have edible food that is included in your fare instead of having to pay extra for everything. However, you aren't going to have a ton of organized kids activities. What you will have, though, is small groups of kids that we have found really get to know each other. Our DD still keeps in touch with the other kids she met on the Emerald Princess cruise we did.
So, find a line that you will be happy with, and even then, maybe it's better to say find a ship that you would be happy with as they can differ greatly even within the line (the Royal Princess, for instance, will be a much different experience than the Emerald Princess and the Ovation of the Seas would be much different than the Jewel of the Seas, etc.)