I have heard that if you just steer the cursor to the top left you will not get hit. In fact, I did this just last night when I was playing ESB. I don't know if this works on all levels, but it has worked for me every time on the first couple.
Not a dumb question. When I try to dodge them, I always get nailed. Even with the trick I mentioned above, it still looks like they're going to get me, but they don't. There just doesn't seem to be any way to tell.