I use mine quite a lot to see connections between different notes or even how widespread some of my notes are. Here’s an edited screenshot of different ‘pockets’ of knowledge:
You’ll notice that “Meetings” is very widespread and linked, whereas “Ideas” is a lot more confined. You can also use View Depth to see different levels within a graph which is very helpful.
Definitely read Paradigm for using supernotes consistently if you’re trying to decide between card parents and card links.