I usually plan "big" trips about eight months out. We go to WDW to golf, eat and/or shop for a day or two on short notice when we visit family in Orlando. That can help and also make me more crazy to get back!
Between trips I collect things, usually deals, I'll want for our next vacation. For example, we drive so I put together travel trays for the kids to use on the trip, "the princesses" send my kids a welcome gift to the resort and I like Disney shirts or themed clothing. I always have my eyes open for Disney coloring books, craft items, snacks, toys, clothes, pajamas...you name it. I buy it on sale or clearance then I have a nice stash in my closet. Yes, I take it out now and then when I'm in a crazy, missing, planning Disney kind of mood!