For those who saw my long exposure shot yesterday, here is the original photo taken as a live shot with my iPhone (and edited in Lightroom to enhance lighting, detail, and convert to black and white), without converting to the long exposure. It’s also not cropped in as tight. I like this one too, for the drama of the water, but like the way the LE version yesterday made the tree stand out a little better. 😀
This one seems to show the turbulence more - your eye still notices the tree but seems to keep getting drawn back to the water. In the other one it's all about the tree... So, I seem to be thinking exactly the same thing as you outlined. :)