this has been an interesting thread, heated even, which is good.
I suggest that another option be added to the poll
"Do you pre-visualise a crop in camera PRIOR to pressing the shutter"
I do, on some occasions, usually when I am shooting for enlarging (I shoot mainly 10x8 and contact print.) To me this is completely different to the photographer who blindly shoots at something then, later looks at the image and goes, hmmmmm well if I crop this out and do this it might work, I call this "post-visualisation....."
Now I know, sometimes you have to shoot on the fly, but for every rule there is an exception.... and apart from some rules of physics and chemistry there are no rules really