In Canada, polling stations are also run by members of the public. I think they get paid, but it's a small enough amount that most people think of it as volunteering. In my experience, it's usually retired people. They also sit there for the day. On election day itself, they're also responsible for counting the ballots and making sure that the ballots are preserved. (I was once a volunteer scrutineer for one of the political parties, so I got to be there to watch the ballot-counting process.)

Regarding early voting, my recollection is that a subset of polling places were open on two or three specific days in the weeks leading up to the election. Like, if my riding had 25 polling sites, only maybe 4 (one in each "quadrant") were open for early voting. On the plus side, I think the early voting days were usually on weekends.

On the topic of "remote voting", my wife is Romanian and used to vote at the train station in Iași, since her official residence was still her home town. I always thought that was an interesting solution to the "voting outside your home district" problem, since it kind of implies that you're away from home because you've been riding a train. That said, since Iași is a university town and most people never seem to update their official residence (like, most of my tech worker friends officially "lived" in their hometown, even if they'd been in Iași for 10 years), the lineup to vote at the train station during a presidential runoff could be hours long. Of course, nobody needs to "register" to vote at the train station, since they just show their national ID card to prove they're eligible to vote.