Waiting outside on a cold night for hours[1] is more than just "slightly inconvenient," particularly if you have kids and work.
Also, if people are only voting once every 2 years, then they're still opting not to vote in a lot of elections (elections where there vote has a lot more impact).
[1] https://www.nytimes.com/2016/11/09/upshot/why-long-voting-li...