For me, Winamp still offers two things that most other players don't: 1) Global hotkeys to navigate through my playlists, enqueue songs, control playback etc.

For me, Winamp still offers two things that most other players don't: 1) Global hotkeys to navigate through my playlists, enqueue songs, control playback etc. Also the global pop-up window (Ctrl+Alt+J) with my current playlist has a really fast search function as I type. Only 'Everything' has faster search. Otherwise modern apps have very slow searches. 2) Milkdrop 2. I have a very large curated collection of visualization presets for Milkdrop 2. This is not something I use when I'm behind the computer, but it's awesome to have running on some screens during a party as the visualizations are in sync with the music.