I use it when I want to draw a graphical data structure that will visually auto-update as I change it. That answer sounds kind of pat, since you basically need to gather enough experience to know when that is useful. I tend to think it's useful in far many more cases than people usually appreciate.

I often screenshare. You can also share the *.xlogic files, even via git, although the company has made it harder to download a free version of the app that can read them read-only. Last I checked it seemed they require a credit card even if you don't buy.

The natural representation of a recipe is a DAG! ;-)