Yes in android

I used to, 15 years ago.

Good times.

Music, no. All sorts of other audio like BBC radio dramas, yes.

I used, but today I use Clementine (is still alive) and sometimes QMMP with some winamp skin

VLC It's a good Music player if you only need to play music

Yes. I mostly use it for video though, but since my Video and Music libraries are side by side, I play my music in it too. I'm not really interested in the visualizer stuff so I'm not looking directly at the player, but I think I know what you are going to say, that it's organization and search capabilities for music has a lot of room for improvement, ha.