In 2002 we made 3 trips to WDW....14 days, 5 days and 16 days....for a total of 35 days! We got plenty of use out of our AP's.
Our current AP's won't get nearly as much use....so far we have 4 days on them, 8 or 9 more in October and another 5 the following May. We would have like to visit in Jan or March....but we have a baby due to arrive in March and probably won't want to be travelling at that point. We have also considered a visit in early Dec. Also, my mil lives in St. Petersburg....so if we go visit her at any point we'll probably stop in for a few hours at WDW, if not longer. But I know we won't get another 35 days!
We always drive...and since we moved to SC from PA we'll be going more often for shorter trips. When we lived in PA we liked to keep the trips long to make the drive worth it.