I know what you mean! I tried to get a room at the Poly with my AAA discount but was told there were no discounted rooms available for my time period; only nondiscounted rooms were available. I considered going to the Contemp where I could use my AAA discount, but for the same money (a room in the Tower), I could stay in a garden view room at the Poly. (I wasn't interested in a room in one of the Wings at the Contemp., which would have been less $).
We stayed at the Poly about 12 years ago and really loved it. The atmosphere is so relaxing when you return from a busy day at the park. So I decided to go for it. Plus the pool area has been redone since we were there, so that'll be fun.
Have you considered the WL? It is absolutely beautiful (we've stayed there twice). It is a good value for the money.
Good luck with your decision making!