I don't need the gui totally changed BUT
I've been on this soapbox before,
Make a gizmo like the volume tone control sliders that is basically a player. The player would see all the songs in a directory structure from 1 to infinity. So if you start it on set one it goes to 2 then 3 etc.
90% of the buttons I don't use, just let me hotkey to developer mode from the player window and away we go.