Gate C is always the worst because it opens 30 minutes late or sometimes even later depending on when the visiting team buses arrive and get parked. Do yourself a favor next year and walk the 100 or so yards to gate B.
This was the first year wanding people so I am not surprised it didn't go well. They have an entire offseason to come up with a solution to the problem. Most solutions like adding additional gates was not feasible mid season.
I also think it time to end the volunteer concession stands. I use to love that they did it but it simply not working anymore. They don't even have every window open during the game in many stands.