Speaking for the local delivery drivers. Your system is horrible. We constantly deliver the wrong stuff because your communication during rush is confusing. You have to physically remove drunk people from the wrong line because you have nothing marked clearly.
Delivery service drivers are people working to make money. They shouldn't be subjected to the mass amounts of inebriated patrons and a slow, loud, and confusing system. Get us in and out with the correct order and all extras the customers requested to benefit us all.
Solution: Put up a simple rope system to extend the line out the door. You are in jeopardy of breaking fire code as it is now. Use that central area to expedite.