I did not check either box on the survey because I don't consider multiple track main lines to be unprototypical, but whether more tracks mean more trains I can't say. The C.B. & Q. had a triple track main line through Aurora, Illinois, known as "the speedway". Fast traffic ran on one track, medium fast ran on track #2, and slow freight and commuter traffic on the third!
When I started my current layout in a 14 x 13' 7" room, I wanted wanted to be able to run continuous trains for those who like to watch trains run. But I also wanted to be able to represent freight traffic between two points. I came up with a folded dogbone design with a lot of yard trackage inside the main line loop and multiple tracks in the yards for trains that can be stopped without tying up the "main". Between these destinations, the single main folds back on itself, so it appears to be a double-track main. As I have over a half-century's worth of locomotives and rolling stock, I run mainly (no pun intended) DC, with the track electrically broken into blocks, including sidings, etc., so that a train can be sidetracked for a "Zephyr", "North Coast Limited", or the "Empire Builder" to come past at a higher speed. I can also switch the main to DCC with DC locos electrically isolated so they won't burn out their motors. I can do switching, but often just bring out a passenger train from one station, run it on the main, bring it into the station on the other side of the layout, wait a minute or so while passengers board or leave the train, then start up for the trip in the opposite direction, without "turning" the train. If there are small kids watching I'll clear the track for continuous running. Having fun one way or the other is the main thing.