locked track visual cue
When a track is disabled, add a visual cue running along the entire track (you already have a cue like this for locked tracks).
It can be difficult to notice media isn't displaying because the track is disabled, especially when timelines are handed off between editors. It doesn't have to be this way — you've already solved this problem with locked tracks. I believe Audition has already has a cue like this as well.
Clint Porter commented
I just realized I named this the wrong thing… it should be "disabled/muted track visual cue"