Municipal elections do occur on a schedule here, but I don't think that's relevant since it's hyper local.
Pretty much without fail, any election that isn't a presidential one has lower turnout if not also scheduled with the presidential one, since many Americans will only show up for the presidential elections. Which is why the ballots tend to be long.
Granted, I don't think this makes them very complicated; my ballot had plenty of offices this year, and it was essentially a one-page double sided bubble sheet, with accompanying voter guides sent in the mail. It's not very hard.