Welcome Moon River,
If you plan to stay on-site at a Moderate, it is often worth it to get a AAA membership if you can book your room at the AAA rate. For our trip last April, the AAA discount saved us $175 on Port Orleans French Quarter over 7 nights. Well, a AAA membership costs less than $175.
An AP is an Annual Pass. Discounts for Annual Passholders are roughly 40% off the full price of the room. But, and it's a big but, the AP discounts are on an as available, first-come first-book basis and there isn't much, if any, heads up before they are released. So, if you happen to find out the same day that AP rates are released for your stay, you may be able to book your room at a considerable savings. On that stay in April, the AP rate saved us $175 more than the AAA rate would have saved us (we switched from AAA rate to AP rate).