hk45, I haven't called the laser a crutch, I've simply said that in my case, for most purposes, I find the laser slows me down, or isn't quite as accurate. (It will group just fine, yes, but parallax affects where my groups center, depending on distance.)
If I had eyesight issues, I might very well find the laser to be an advantage. My eyesight is between 20/15 and 20/20, and I have to pass color vision and depth perception tests every six months (1st class aviation physical exams), and I have good night vision, so thus far that isn't a factor for me.
Do I think lasers are a crutch? In many cases, no, but in many cases, yes.
A lot of people seem to buy them, thinking they'll be easy to use. I've seen quite a few get very disgruntled, very quickly, with the amount of motion the laser dot displays. I've also seen quite a few who could steady up the dot pretty well, until they actually pulled the trigger. The laser doesn't replace shooting fundamentals, but some of the people who sell lasers seem to want to make buyers think that it will.
With regard to the military guys who've chimed in, saying they always use lasers inside 50m, ok... I've seen lasers left and right on M4s and M16s. I have not yet seen a laser on a standard sidearm. Given that the Army teaches not using the sights on the M16 in close, but instead looking over the carry handle or ACOG and lining it up that way, the laser is probably every bit as accurate. Shooting around barriers or corners is also a much more likely scenario for an infantryman. Also, some military lasers, designed for use with NVG, don't give away position unless the other guy is also using night vision.
But again, I haven't seen lasers on M9's or M11's. It's possible some of the tricked out, special purpose sidearms might have them.
Anyway, back to HK45... a shooter who already knows what he is doing can reap benefits from a laser, but it isn't necessary - unless vision is becoming a problem. A shooter with vision issues probably will get a big return from a laser.