I don't know how many people actually use music visualizers.. like, just sit and watch them.
I know that personally every once in a while I just like to set up a playlist and sit back watching a music visualizer. it's pretty relaxing, though I could see a lot of people finding it quite ridiculous.
Ambient music or most anything electronic works pretty well. I'd recommend doing this if you ever get a chance, have some spare time, need to think things out or just want to try it.
hope all is well in the world.
dddd//-