We were there Monday morning - it was about 10:20 and we were going to either get a snack or lunch early so we walked by there to check out a menu. A line began forming and we saw they opened at 10:30 so we got in line and decided we would have lunch there.
At 10:30 one cashier came out and they opened the windows and you could tell the CMs were shocked to see every line filled with people. A few minutes later a second cashier came out and then another person said only the first two cash registers would be open but about another 5-10 minutes later a third opened.
Food was not ready - the first person probably waited ten or more minutes for their food so yes there was a back up. I would say while we were there the place was very busy.
In addition the birds were terribly agressive - I was sitting at a table waiting for my husband and felt something and it was a duck pecking on my shorts!!!
Liz