Multiple video tracks come in handy when you are compositing (putting one video layer over another) or creating certain effects (like enhancing colors or picture-in-picture). I also use them when using track motion (where I move or zoom the video) and want to segregate the video so I don’t effect any other video track.
Using special effects and lots of track motion, I have had projects with 100 video tracks, and usually average about four or five per project, along with two or three audio tracks.
