Yes, if the enemy has NV gear, they too can see your IR. However, against an unsophisticated/poorly equipped enemy, you don't run so much of a risk. As I see it, the IR and NV combo are simply a better alternative to using tracers at night. The enemy will in most cases see the flashes from the weapons firing anyways. Ballistic will cause the rounds to only hit near the laser dot so you are really only using it for general aiming and ranging.
P.S. I wanna green laser too, but one that is weapons grade. A pen laser is not going to cut it for me, I want one with a proper mount and built to take centerfire recoil. This means the SF L80 or a green OTAL if those guys get off their duff and make one. Either way it will be more expensive, but worth it to me (for the fun factor, I don't use them for business)
Edited to add, hey, I would like a cheap green laser so when I sit in the audience and laze the wrestler in the ring, I will know it's MY laser [}:D]