I'm not sure why you think it will take all night...
Ft. Wilderness campground is just a boat ride away from the MK, like Wilderness Lodge. It's only a tiny bit further. It's generally a more economical buffet meal, but still with wonderful choices. Even though it is scaled down, I'd say it is the best value you can get with the smaller bill you'll end up paying.
What exactly is it that concerns you? Why did you pick it in the first place... just because you wanted to see Wilderness Lodge? (You will get to see the outside of it from the boat ride.)