I remember hearing about this ten years ago, and I played with it, and it's cool enough, though for the life of me I have not been able to figure out anything actually useful to do with it. Does anyone use it as part of their actual workflow?
I personally enjoyed those sessions, it gave non-coders an opportunity to point and ask questions about various clusters of nodes or find out why we were working on certain things at particular times.
The value was debatable to be sure. Fun though.