Here's what I would normally be looking at, rather than that image, since TB will hide edge verts if you select a corner and vice-versa. Not as bad, but still not great.
Hiding any more verts is problematic, unfortunately. Perhaps an option to cull/occlude ones that belong to brushes that are obscured from view, but that seems like a lot of work/processing to get that improvement.
And it would have to be an optional toggle, for that
one guy who
really wants to drag a vert on the opposite side to where his camera is for some damned reason...