We enjoy Animal Kingdom, but, having said that, it's probably my least favorite of the four parks. I've only spent one day there, however. We have some more time planned there for our next trip, so maybe my opinion will change.
I think AK is worth is if you use a hopper pass to visit early in the day, then finish your day at another park. However, I don't believe it is worth the one-day, one park admission price. What we're doing is two AK mornings until 2 or so, then taking our afternoon break, then hopping to another park about 5 or so to finish the day.
At the Animal Kingdom, we really enjoy the Safari, Dinosaur, Festival of the Lion King, and the (underrated IMO) Flights of Wonder. Most of the other stuff is fun, but I can take it or leave it. I'm REALLY looking forward to Expedition Everest, though.
Bottom line is, give AK a try. It's fun and really different from the other parks, and it might become your favorite. I know I'm looking forward to being there in a week or so.
