I'm also in the eagerly waiting category. I did it randomly this year (long story, but basically I had a weekend off from my part-time job, I decided to go to WDW, and then a friend said "Hey, that's Expedition Everest!" and it was still open, so I registered and did it) and really want to do it again.
I'm debating my ticket options for Marathon Weekend, and was thinking about just getting an AP, but unless Everest happens, I'm not sure it would really be worth it (beyond the early registration option). I know I don't have to make a decision now...just budgeting trips and stuff it would be easier to have more advance knowledge.