This is one reason why I still think lasers on pistols (Crimson trace grips specifically) are a Good Thing.
You never know how you are going to deploy a gun if you have to, maybe it will be from some wierd, awkward angle, maybe you will be grappling around in the floor, maybe you will have to use your non-dominant hand and eye and forget all your normal shooting training. CT grips allow you to see where the gun is pointing without actually having to line the sights up with your eye, which you may not have the opportunity to do.
Plus, if you do practice point shooting, it's really easy to tell if you are spot on or not!
I practice it to some extent, but not seriously, just with what I have read on the internets, along with "combat" shooting or whatever it's called- crouched, legs spread, realy tight grip on the gun, staring at target, etc.