Experienced AK for first time a long time ago--- and it was and still IS a 1/2 day park. PERIOD. (FOR ME)
AND it's a 2 day park FOR YOU. Quantify your statements also

I never cared for Animal Kingdom, but on our honeymoon, my husband really wanted to go since he had never been there before. We went there first thing. We would pass an attraction, he would ask me what it was like, I would tell him, and he would tell me whether or not it interested him. More attractions than not didn't interest him. It was probably 2 hours later that he asked me if that's all there was to the park. We left. For us, it is absolutely a half-day park. I also think most people who come here asking for advice and tips know that they are getting people's opinions and all it takes it one person saying he spend 2 full days at Animal Kingdom to prove that it is someone's opinion and not fact.
Between you, me, and the fence post, I think DISNEY believes AK is a half-day park... at least to most guests. Otherwise, I don't think they would have moved the parade to so late in the day in an attempt to try and keep the guests later.
For us, Epcot is absolutely a 1/2 day park. Our younger children are completely bored by most of the attractions especially WS. Sorry, but having a few kid stations is not going to keep them interested and I didn't pay all this money so they could come to Disney to color. The rest of the day we re-visit one of the other parks.
Epcot for me is actually two half-day parks, which I know sound like one full day, but isn't. I don't care anything about Future World East (Ellen, MS, TT) And only a select few things in Future World West (Soarin', LWTL, Turtle Talk with Crush, Imagination). And, of course, I enjoy Spaceship Earth. Since I'm a rope dropper, I get all of this done before World Showcase opens, get bored,and want to hop. My husband loves Epcot, so when I'm with him, I don't leave. When I'm alone, though, I will hop to another park. Then,on another day, usually shared with DHS because it's so easy to hop and I spend most of my time there, I will take the afternoon and hop to World Showcase.