Regarding the traverse around the rock pool to gain access to the Stumbling Blocks area, there used to be a really nice little nubbin for your feet on the step across move towards the end of the traverse...
It's gone.
Makes the step across a bit more interesting, especially when the water is particularly dank (which is nearly always) so, word to the wise I guess. Don't think this single move warrants a grade change for the traverse, but it does indeed spice things up a little.
Hikers, river swimmers, and other folks pass through the traverse every day. Its one-way only, and it only takes one ameteurish person to clog the route. With crowds, you can end up waiting half an hour to cross on a sunny weekend. A great alternative, depending on your gear situation, is to come prepared to swim around.