We don’t usually have queues where I am either, as I am in a small state, but in some places the voting districts are much larger for practical reasons. Complexity doesn’t scale linearly.
I don’t know how complex your ballots are, but we tend to vote for many things at each election, sometimes as few as 5 or 6, mainly offices, but sometimes dozens of ballot initiatives as well. That can slow things down.
And of course many places create bottlenecks either through an unwillingness to fund the process adequately or through cynical intent to suppress voting.
