NO NO NO NO Epcot is up there with Magic Kingdom for us! Honestly, I think we ended up spending more time at Epcot last year. All 3 of us (me, DF, and DD) all love World Showcase, it is beautiful, I could live in WS hahaha.
Not only is WS beautiful and worth every minute, but Soarin' is awesome

And The Seas with Nemo is cute and you'd have to see Turtle Talk, DD gets a kick out of this, I do too, I love Crush!
And Test Track...and Mission Space....and, we just love Epcot!
We always spend half a day @ AK, while it is beautiful and we appreciate it DD is scared of It's Tough to be a Bug (liked it 1st yr, 2nd yr wanted nothing to do with it), she didn't care for the River Rapids, is too little for EE, was scared of Dinosaur, so really the only thing she "must do" at AK is the safari and I like the Nemo show. This time we have to see Festival of the Lion King, still have yet to see that one.
O and also wanted to add that you said you had 2 little ones so at the countries they could make masks and meet the different cast members from those countries, they will stamp your mask and they give you a little item to put on the mask. DD really enjoyed this, we had her say Hi in Mexico, Italy, China, Germany in their native language, the CMs thought it was cute too. And in all of Disney World DD's fav ride is Mexico, not really sure why I will admit other rides in MK top it, but I don't know, she adored it.