Long story short, it will help you kill the other guy faster.
My skill level in first person shooter games consists of screaming and spinning in a circle. You see that person shooting wildly, spraying bullets into unsuspecting bushes and buildings until they run out of ammo?
You probably laughed with pity while you aimed and popped a shot to their head. Yeah, that was me. Good times.
But that was then. Put me in front of a game with this snazzy invention, and you better duck for cover.