I use heavily for keyboard customization. I have all sorts of macros, like moving windows to different parts of the monitor (e.g. left, right, center, top center for video calls), making keyboard navigation more similar across Linux and Mac, launching and positioning apps with a single keystroke, auto-entering common data on a website, and so on.

And there's tons of other use cases (which I don't use), including gestures, controlling gestures, trackpads, MIDI settings, Elgato StreamDeck, and more.