But IE6 is fucking slow and ugly and irritating to use. 
But nobody particularly cared about it that much at the time because there wasn't anything that superior to compare it to. That's my entire point. You can't miss features that you've never had.
The keyboard shortcuts that my friend has are mostly for quicker artist/album/genre navigation and searching.
You've missed the point with the spectrogram. It's not specifically useful, just quite a neat thing to have. In the same sense that last.fm isn't that useful, but I still like having the stats. And I knew iTunes displayed album art - they all do, I didn't mean that displaying album art itself was a new feature.
iTunes on a Mac runs massively smoother than iTunes on Windows does. Plus the decent alternatives aren't available for Macs, so there's not much else to use anyway.
Still doesn't change the fact that foobar2000 is to media players what Chrome is to web browsers. I don't find Firefox to be that slow, or that resource hoggy, but it still fails compared to Chrome. Winamp fucks about a bit when I'm doing CPU-intensive stuff, christ knows how badly iTunes would fare, but foobar keeps itself fairly smooth even when my laptop is dying otherwise. It's the only times I use it because I've still not bothered setting it up properly.
Foobar has some cool metadata stuff that I've not seen in other audio players too, such as listing the exact codec version as well as just bitrate for albums and stuff. Again, not necessarily massively useful, but nice to have displayed.