I spent an afternoon in a ground blind for the first time last season with my son and a "guide" at a State sponsored Youth Hunt. I was pleased with the result. Three of us in there, moving a little, talking quietly, sitting on chairs and upended buckets, sturdy rest for the rifle, watching out of the screened windows, not affecting the movement of the deer.
I believe a ground blind not only gives great cover and shields the hunter's movement, it also blocks some distribution of scent. If the deer are moving you can put up a ground blind fast and easily near their path. That isn't done with ladder stands. Perhaps the tree climber boys will chime in too. I don't use a climber. I almost always use a ladder though.
I have been poised to purchase a ground blind. They have their distinct advantages. In particular - portability.