AAA for room discounts, including this past summer. I have always had to call Disney to book our AAA discount.
The value of the discount will vary by resort and time of year. My experience with POFQ in the summer is 10%. At least one other time at another resort I got 15%.
Often Disney will have discounts that exceed the AAA offer. Rooms available are limited like at most hotels. Usually you can swap the discount for the lower one.
We have AAA. It pays for itself in hotel savings. POFQ is often not included in resort discounts when we go so that pays for the card itself. The other hotels we use it for are a bonus. You have to decide how long to wait to make the decision.