That liveliness reveals the nuances (and flaws) in your playing. That's why dynamic, nuanced players like them so much. Subtle differences in picking and fretting really stand out.
Dumble players tend to be light pickers, because that gets you down into the middle of the amp's huge dynamic range. If you're banging out power chords or chugs, any decent amp will do. But when you pick lightly, and only hit hard to make a point, you can make the amp do all kinds of tricks, and you start to appreciate its Lamborghini-like response to the throttle, steering wheel and brakes.