I only use three. Xtol, rodinal, and d76. I vary the dilutions for the look I want.

Though I can kinda see the allure of rodinal stand development. I do it for the shadows and grain, but being able to multitask is nice. For instance I developed 13 rolls in one session with it today, while teaching a class, shooting out emails, and setting up a computer for movie projection today. It's handy and serves its purpose. Earlier this week my other students developed with d76, which would be impossible if it was only me.