I used to use quite a few plugins in Winamp, as well. In particular, I always needed a gapless playback plugin in 2.x. Been so long since I've regularly used Winamp, I don't recall what other kinds I used, but I do know I typically used several. I probably had several visualization plugins, as well, particularly back when I was in college and would have friends over in the dorm. Music on in the background, visualization full screen.