It'll be tight at the cabin, but not un-doable. I stayed earlier this year and while it was perfect for my family of 4, my parents joined us a day later and it was a bit cramped, particularly because there is only one bathroom. I probably wouldn't do it again (for 6), but it's doable. Everyone just needs to accommodate.
Otherwise, the cabins are wonderful. I'd like to stay there again. My kids loved it.
We stayed at the cabin closest to the boat dock so we did not need the internal bus system or the golf cart. Maybe you can ask?
If budget is an issue for you, also consider that you'll have a kitchen so you'll be able to cook and save a few bucks there. You won't have that opportunity at values.
Last, as a dad of 2 small children as well, the benefit of having the car right next to the cabin is a blessing. The convenience of not having to lug all the baby bags, toys, and other miscellaneous junk from the room to a parking lot blocks away is a hidden value. Arrival and departure at a hotel can be a real pain with kids but that burden is entirely removed with a cabin stay. Enjoy.