We bought it one year, and like an AP got two trips out of it by doing a week at the beginning of the year (June) and a week at the end of the year (May). Both trips were centered around golfing, so we were playing 4-5 rounds on each of those trips. The first trip we had another couple with us, so we were getting the discount for the entire foursome.
We booked our tee times right at 90 days out, and asked for them to be as close to 10am as possible. Booking that way, we were teeing off between 10 and 10:30 for each round.
It may not be worth it if you are just planning to fit in a round of golf while others tour the parks, but if you are planning to buy several rounds it can save a lot of money. (I'm also not sure if it is worth it for the high season, as we would never play then because it's too expensive - we're cheap!) You should do a cost/benefit analysis for yourself and see if it will save you money.