Staying at the Fort is NOTHING to be WORRIED about...as a matter of fact, your AAA agent has done you a major favor by turning you on to the Fort. The kids will LOVE being there...its simply the best resort Disney has to offer,especially when kids are involved.
One suggestion, though...instead of renting a cabin because of the # in your party,look into renting a camper.
www.CampAtTheFort.com has a beautiful, large roomy 5th wheel camper that they deliver to your Fort Wilderness site and set up for you, show you how everything works, and then they return when the vacation is over and take it away...all you have to do is show up and move in, just like if you were renting a cabin. Im renting from her in October(even though I have my own camper...this way I dont have tomake the 550 mile tow,and the camper she rents is MUCH nicer and roomier than mine, it sleeps up to 9 ppl!!!) and am so excited about it I can hardly wait. Its less expensive than cabin rental, and opens up the entire campground in terms of where you may get located at within the campground.
If the dates you are looking to travel on are already booked, check with
www.MakeCampingEasy.com , they offer the same service as well. Both website owners are regulars here on the Dis Camping boards and come highly recommeded.
The fort has SO MANY ACTIVITIES that Im pretty sure it will end up being your families favorite vacation spot after you visit once. We rented the cabins for the exact same reasons as you a few years back...I barely knew the Fort even existed,other than the HoooptyDo Review and Mickeys BackYard BarBQ....but one visit and we were completely hooked and we now own a small camper and a golf cart to bring with us so that we never HAVE to stay at another resort!!
Relax...the best thing that couldve happened to you has just happened...you just dont know it yet!!