We live in Reno, NV and we have APs. We make an annual trip before Xmas every year, so we knew we could get two trips(5 days each) out of them even if we didn't do any others. But since it only costs us gas(getting to be a hinderance), hotel and food we went for my birthday in Feb and we will be going in June and again August for my 2 girls' bdays. I'd love to squeeze a Halloween trip in there, we'll see. We utilized the AP discount for a splurge on hotel, concierge GCH, last Dec. I can't say that saved us money tho...lol. We won't renew next year, we will take a year off, buy 5 day hoppers at Xmas and upgrade before the end of our stay, so we'll have AP for 2010.
As long as you go more than once a year, its worth it.