I guess what I'm going to propose is blasphemy, so please don't flame me, but it worked for our family.
I think you'll be ok this time, but your family is getting big. Especially as kids get older, any kind of hotel room seems to shrink somehow. What we finally did was rent a house behind Splendid China (anyone remember that?). Travel time to AK was about 5 minutes and all you had to do was cross US-192. It had a private pool, 4 bedrooms, etc. Especially when you have kids at napping age, it was nice to hang out in one part of the house (or even the pool) and let them sleep without worrying about interrupting them. Once the kids got a little older, we stopped renting the full house and have done condos/townhouses at Windsor Hills...also convenient to WDW. Not saying you should do this now, but something like it might make sense for you in the future....especially on longer trips (anything above 5 nights or so), and it can save a ton over Disney resorts, even adding in a car.