If it makes you feel any better, I was at the AKL for Opening Day and Week and had the most incredible stay. The concierge was wonderful, the best on property, in my humble opinion. I was also a concierge guest over the holidays, and again had a wonderful stay. I have had nothing but lovely experiences with the AKL's concierge (and regular) staff. They all are wonderful. I hope you have a nice stay there, too.
I have been in the GF's Royal Palm Club concierge lounge when it was dead, and when it was super busy. The same for the YC and CR's concierge lounges; both when they were dead and super busy. It is always hit or miss with any of the lounges. If you happen to show up right as they are changing the food selections (which is well-publicized as all the resorts give you a schedule of the lounge offerings when you are a concierge guest), that is when I have noticed it is the most busy. I try to stay away from the lounge at those times. It seems to work out better for me if I do. If I show up at a slower time, I get more interaction from the Cast Members, which is always a highlight of my stay. I really enjoy speaking with them all.