For long, I wished Winamp would be open sourced. I don't understand the benefit of keeping it closed. I'm not sure I would be back to using it though. I'm used to my current player, which already does everything I would expect from Winamp, with a (arguably) worse look but much better UX. Audacious with the Winamp classic interface is also a great Winamp for those who (still) fancy this look and feel.
What player do you have that has better UX? Winamp was lightning fast, could do anything in a few keystrokes (especially that "jump to" dialog was magical) and got out of the way. It was perfect.
I can indeed do most things with a few keystrokes, including queuing and finding things in the playlist (by filtering).
It's not as lightning fast, but it's fast enough. It supports several playlists and has other niceties.