Get an AP if you plan on more than one trip, or your one trip is long enough for it to make sense. Let the perks be bonuses.
Power Pass works as an AP for hotel discounts. But you get NO other discounts with it.
Preferred or Premium allows for hotel, restaurant, and souvenir discounts.
We don't eat at CW much (just Margaritaville) but they do have discounts. I'm pretty sure we get an AP discount at Margaritaville.
To book the hotel go to the loews hotel website and use "APH" in the code field to see IF there's an AP rate for your dates at that time. There's a thread about the AP rate in the hotels forum here. I think AP rates for August are out now. They only release them a couple/few months out.