Well, for starters, I know it's not the smartest, but when I see the door has been breached, I go in with knife in hand, sneak to my weapons and sweep my place before I even call the cops. It's just me, but I'm mainly interested in catching the guys more than having the Police protect me. I did have to deal with that scenario once, but I'm just territorial like that. I don't think weapon length should be the primary consideration, but of course I think we can agree that it obviously IS something that should be considered. As you point out with your tactical movement example, at the end of the day, it really comes down to the weapon you are most expert with. Better to use the .22 revolver you never miss with than the SAW that you can barely swing.
1) No clothing movement to give away my position.
2) No shoes to make noise on the hardwood.
3) No time wasted looking for my drawers on the floor in the dark. Leave the fact that I was able to grab my night vision out of the closet and my Glock from its place in the dark with my eyes closed as a simply attribute of my character.
4) If dude turns on a light when I start whispering to him in the dark, he's gonna be a whole lot more emasculated than if I was ONLY pointing a pistol at him.
I used the IR light in the Living room after I was in there listening for a second. We had blackout curtains in that big ass room and there was just NO ambient light.