It's difficult not to pick MK because our early nostalgic moments are there. When I picture myself at WDW, I'm walking down Main Street USA. I'm glancing at each building in turn, peering at the window labels. I see those colorful balloons swaying and the aroma of sweet vanilla waffles from the Parlor fills my nostrils.
Our top attractions are at DHS (TSMM is probably my favorite, followed by ToT, then Soarin'), but if skipping shows like Indy/Fantasmic, we're easily able to leave after a half day. We love the special events at EP (Flower Garden, Food and Wine, Christmas candlelight/stories, New Yrs, etc.), and simply walking around WS. We like AK for it's sprawl (always seemed less crowded in the past - that's seemingly changed now) and shows. Kali is among our favorites and we've done it as many as 15x in a row. I think with Pandora, AK will probably be our 2nd fav. (especially as wait times settle down after a while). Until in 2019-2020 when DHS becomes our new #2.
Our current trip - we are supposed to be picking FP this month and we haven't even figured out which parks we want to be at which days. I'm having a hard time justifying hopping without a good excuse (Halloween party forcing early close at MK but the early EMH tempts you into starting there). We know we're going to have to allot more chances at AK, and have our FP's there whether it's 1st or 2nd park of day.