I would say not and pay out of pocket. We typically go in the fall when we can snag a free dining offer, but that I believe never applies to Fort Wilderness.
I know we never go away hungry and we could even split meals at times too. You get desserts which honestly we would never order if we were paying out of pocket as we are typically full.
Bottom line is if you order what you like and not the most expensive item on the menu, split meals, forgo desserts, you will come out money ahead paying out of pocket.
But.... If you are doing a lot of character meals which are typically buffets, it may be closer.
Here is a Disney dining plan calculator that may be helpful as well.
http://www.distripplanner.com/