My S20 gets used the most as a night light on my computer desk. It's bright enough even with some ambient light from the streetlight at 2am to check on the baby if he wakes up. In fact, sometimes it's too bright so I switch to my T10S for the lower ML.
Another good use I discovered for ML mode is that it also doubles as a great locator beacon just in case you drop your light. Happened to me in the bedroom, found it easily (rolled under the bed) since it was on ML mode. Drain on ML is also negligible so you can do this for literally forever. (If you're like me you probably have enough batteries to run your light for a few days on high, and I just started with this hobby a few months back).
Although I have to agree that too many modes can be a pain as well if the UI requires the user to cycle through them. That's why I prefer UIs like the S20. ML and high from off.