I've been to the all you can eat section before. It was a very good experience. The seats are bunched together down the left field line. Relative to the attendance, there weren't many people in that section when I went (crowd was around 30,000).
They give you a plastic bracelet to wear for your food. The only concession stand you can go to is the one right near your seats. There were two people there to wait on us. They only offer soda, hot dogs, popcorn, and peanuts. There was absolutely no line at all during the entire game...that was the best part in my opinion and it's the reason I'd go back and do it again.