WinAmp - Nuff said.
My music is stored on E: in a simple folder system
E:\ TYPE \ Artist \ Album \ Track
e.g
E:\MP3\Metallica\Black\01-Enter SandMan.MP3
That way I dont need a stupid program to organise a thing, I simply go to the folder that I want a file, according to that way, and if I dont have it, its not EXACTLY where its supposed to be.
I also dont give a stuff about playlists either, even though WinAmp does them great, I simply use winamp on my PC, phone and tablet and searching for the tracks I need is a matter of split seconds.. .Most of the time its a damned sight faster than silly playlists too!