Lasers can be useful tools, but tend to foster bad habits. If you must have one, become very proficient first and then start practicing with the laser. Once you are comfortable, take it off and make sure that you can still do everything you need to without the laser.
I'll disagree that a weapon mounted light is a bad idea. I can see the hesitation to have to point your weapon at something just to light it up, but with proper trigger discipline, it is a non issue. Also, (I do this a lot) you can quickly detach the light and use it like a normal flashlight.
I like having the light on there because I want to see what I am shooting at before I kill it. I can get through and around my house in pitch black with no issues, but I want to have positive ID before I pull the trigger. As long as I don't use the light to get around the house, there is no tactical disadvantage, and the intensity of the light will cause enough pain for me to get a shot off if needed.
Food for thought I suppose.