If it is just the DW & I, we may stay at the campsite a few days during the whole vacation, but we still keep our AP's renewed. We may just look at each & say - "Hey, lets go ride Space Mountain & get some ice cream" and we are gone.
Sometimes if we do a non-Disney vacation (Universal, Sea World, Bush Gardens), we still stay at the Fort. Most of the other campgrounds in the area are 'dumps' compared to FW & not much cheaper. I have stayed at two different KOA's, Sherwood Forest, & Tropical Palms and they were all a joke.
There is just nothing like the Fort.