Hi new member and Roll Tide!! We usually try to get at least two trips from an AP. Last year we purchased our AP's for our late June trip and will use them again for an early June trip this year. Uses this approach you only have to purchase the passes every other year. Others prefer to buy the 10 day MYW park hopper passes with waterparks and no expiration and can make the these passes last several trips. You really have to look at your traveling patterns to see what works best for you.
We like the AP's because we can just go to a park for a couple of hours on arrival or departure day without having to worry about burning a day's worth of passes like you would with regular park tickets.
With 10 day MYW park hopper passes with waterparks and no expiration you get ten days of theme parks and ten entrances to waterparks. If you go for say a five day stay and just want to do a couple theme park days, a resort day, a couple of water park days, these tickets would be ideal. You could really get several trips with them.
We tend to go to a theme park or two every day so the AP works for us.