Winamp was the only MP3 player for my former Cyrix PR233+ or so that woud'nt hog up the CPU like Windows Media Player would.
Since then got hooked to it, and still using it today. Spotify just cant beat it. The quality of a good MP3 or even flacc is just better then spotify as well (and I use HQ streams).
I agree that winamp does well on all older and lightweight computers, not everybody have the luxury to have the money or need for a super powerfull pc, or soundsystem.
Most people who I know use winamp on their laptops and tablets as well.
VLC is good for playing super hires movies with difficult compression, for normal mpg and lower bitrate movies I use MPC if not work .. VLC
And winamp for all my music which often is flac or at least 320 Mp3 as I love the skins of my winamp showing as a super high quality hifi set
It took me ages to get my music into flac/wav/mp3 as the online stores often do not sell the HQ or use VBR which degrades the quality, and I really hear the difference very well if it is recorded at high bitrates. Often it is only less than 128 or 192.
Especially if you listen classical music with low grade bitrates I hear it almost instant, as you either hear the breakoff of the voice as it should have been or miss the effect of instruments which you clearly hear at the higher segment recordings
That is also why I always try to get studio recordings through my friends who are able to get their hands on them, which often are gifts, and sometimes artists sell these great quality products themselfs.
I admit you need a pretty darn good soundsystem to hear them as well, a simple soundsystem can often not even come close to be able to play it as the artists wanted.
Now if you buy these systems new the prices are scary high, but if you are like me in a large group of music lovers with superb systems they sometimes sell their previous systems to the others and that is where I get the superb gear I use.
Still pretty costly but well worth buying as these products are build to last very long.
Some even own systems older than I am and really never want a new one