I would definitly go. While the park can be wrapped up in say, 3/4 of a day (though some may disagree) the way the animals are presented is simply amazing. Having no fences visible with large roaring lions very close to your very open safari vehicle is just not to be missed. The attention to detail and theming is wonderful. When taking the safari (you must do this, its the main attraction at the park) you look out on what you know is central florida, yet looks almost exactly like parts of Africa. I understand thousands of plants were transplanted to central florida from africa just to gain that realism. The effort suceeded.
There is much more to do besides the safari and animal viewing walking trails. (Which you must do as well. I found the bat room very VERY creepy and fun.) There are a number of rides that are fun and scary. I can't recall the name of the dinosaur time travel ride, but it freaks my DW out. She loves it and so do I. The 3d "It's tough to be a bug" show is pretty good. I've seen the one in California, but not the one at AK cuz DW has a thing about spiders so its not fun for her. Its cute and entertaining.
Asia hadn't been built when I visited so perhaps other DIS folks can chime in on whats there to do.
So I'd go, check out the park and if you get bored, enjoy a beer or three and go hop on over to another park. Thats what the "hopper" part is for. But I would definitly give the AK park a shot.
Darian