I don't recall multi-grain buns being used exclusively at AoA the last 2 years. We've stayed at POP and ate at AoA at least once each of the last 2 years - November 2012 and November 2013. I'd remember, b/c I hate those things and had burgers both years. I remember when all the parks used the multi-grain buns a few years back, those things were nasty and ruined my burger experience, so glad they're gone. lol
I'm a picky eater and there was plenty that I'd eat at AoA - their food court is a bit better than POP, but still on par. But they do use real utensils and plates instead of plastic and paper.....
We've stayed at POP 3 years in a row now and are scheduled for our fourth this year - great place.