For some things, you can use a disk with a stroboscopic effect. Sometimes it's good. You see how much material you grind.
https://www.youtube.com/watch?v=rS7T5-4RUEA
I use a pad with a rough sanding cloth a lot. It does not burn material and grinds quickly.
https://www.youtube.com/watch?v=RZX4FNvw7HM