I agree with you on AK, it needs as much more as it can get. Everest was the best addition so far, but there's still much more room for improvement to make it an all day park.
I think the popularity of Disney's new attractions doesn't speak to their quality, so much as it does to the need for fresh things to do at WDW. Frozen, Mine Train, and Soarin' aren't the best rides in the world, but guests need new rides so bad that their Fastpasses run out as far as 60 days in advance. Luckily WDW is finally getting new things over the next five or so years, because clearly the guests are clamoring for (literally) anything new.