I used this player for about three years and I love it more and more, with each new release. Statistics show around 60% of the Linux users prefer Amarok over any other audio player. 60%! That's huge.
This article lists 7 reasons for which I think this is the most loved audio player. I preferred to leave out the more technical ones, and just focus on the highlights.
1. Powerful collection management
Over the years I tried many audio players, both KDE and GNOME, and even CLI ones like ogg123 or mpg321. But none of them could handle a collection the way Amarok can. It even includes an integrated file browser, so you can drag and play songs instantly.