YEAP, it is, I love going to AK to have this too. It is the best CS meal in WDW and quite reasonable!!
As far as other restaurants I do agree with other posters, the salmon is excellent at AP and FF. The mussels are also excellent at FF as well. I am a salmon person so I also tried it at Jiko, definitely didn't disappoint. The nice thing is it is prepared quite differently at all 3 places I just mentioned. OH, and not to forget the salmon they prepare at CP at lunchtime, yummy!!
Also Blue Zoo at the Dolphin is very good as well. I had the snapper there and it was truely excellent. We're going to try Narcoosee's for the first time in a long time next week so will report back on that.
Have you looked into doing Italian? I highly recommend Palio at the Swan as it's our favorite Italian in WDW, unfortunately it will be closing for refurbishment soon ...so bummed!! Hope they don't change it too much!