For multi-monitor users having acceleration on is heaven because you can go across 3 screens (also with high dpi + max speed) by moving your wrist 1.2 inches instead of pushing your mouse half way across the room.
Acceleration ftw!
I do use multiple monitors and I could not disagree with you more, I like to set my mouse speed where I like it, so I know that a "flick" of the wrist won't mess me up. It's about precision.