It's a combination of slightly busy and CM new at their positions figuring out to best make the booths work. Since it's a Friday night, there will be a number of locals coming out to the booths. The lines aren't too bad, but tend to move slowly. I have actually seen booths completely rearranged between Friday and Saturday to improve the flow of customers and workers.
You also can visit the festival on the day before opening. There is normally a CM preview event with the booths open to the public for practice.