Here's my take: No.
Anything that encumbers the firearm is more of a detriment than an aid. Need more light? Keep a real flashlight handy in the nightstand. A mega-flashlight is much cheaper and more powerful than any firearm-mounted light.
Laser? Eh, maybe. Spend a couple hundred bucks to make a little red light that you have to turn on, or go out to the range and practice close-in point shooting. I figure anything far enough away that I need a laser to sight on it probably isn't a deadly threat.
I know, everyone's going to come back with the "what if's" but really, how often do those what if's happen? How often are you going to have to rely on that $250 laser or light to save you?
You can't protect yourself from everything all the time. If you want to lug all these extra expensive attachments around on your gun, by all means, go out and buy it. I think it's more cool movie hype to have them than a practical usefullness. For me, a think a loaded gun will suffice.