For us, we go a lot. We went in 9/00, 9/01, 12/01, 2/02, 5/02, 7/02, 8/02, 9/02, 12/02, Christmas 02, 5/03, 6/03, 8/03, 9/03, 10/03, 12/03, Christmas 03, 1/04, and we're leaving later on this afternoon for another trip. We moved to GA in 1/02, so we Disney is only a 5 hour drive, which helps a lot. We had AP's from when we lived in PA and did two trips, so between being able to drive and not having admission costs, it's easier for us to go often.
Usually we only go for 2-4 days at the most. That helps cut costs, too. We alternate resorts depending on how much extra money we have at the time. Of course we prefer the deluxe's, but we're fine at a value or moderate as well. And, in cases like tonight, we're leaving after DH gets home from work. We probably won't leave the house until 4:30 or 5:00 pm. By the time we get in we'll just collapse into bed, so we either stay at a value resort or priceline something, so we're not wasting a ton of money when we wouldn't notice anyway. Tomorrow, we check into the GF.
The AP rates are certainly a help. I have to admit, I am a TA, so those discounts are quite nice as well. Plus, to some extent, I blame all of our trips on "research" The main thing is that it's just DH and I in GA, none of our family is near. DH works a lot, and so we go to Disney to get away and reconnect. It doesn't much matter whether we eat at V&A's or the Electric Umbrella, we're there together, and that's the important part to us. We're willing to cut what corners we need to to make the trips happen. We also don't have kids, and while DH makes enough to cover all of our bills, I have two jobs that I do from home, so that extra money doesn't hurt.