PDR1 it is good to see some numbers and your post triggered a couple of minutes search which found a green laser with a beam diameter of 2x7 mm and a divergence of 2 mRad. Apparently their advertised use is for pointing out stars which would be a bit difficult if they wave around as you suggest. But I imagine that gets a bit slow and aiming at planes might be tempting. The beam diameter therefore at the distances we are talking about seems to be over five meters and my real life rather than theoretical input is that they can definitely hit you.