I have my touchbar display the time, battery percentage and current song, so when I look down it's mostly to look at these. I also have a script that displays the last line of a particular file, so if I pipe a script's output in there I can look at its progress. I can swipe anywhere with two fingers to change the volume, three fingers is ctrl+tab (that one isn't useful, I need to figure out a better use), four fingers is brightness. I like it better than the F keys.

I did have to remap Caps Lock to ESC, because ESC on the touchbar was nigh unusable.