SWX has copied this functionality from I-Deas (and possibly others). However, what you can do in I-Deas is rescale the symbol display size by zooming in and forcing a re-draw. This makes the symbols appear smaller, so you get the benefit of them without cluttering the screen.
Maybe we should all ask for this enhancement.
Something else I find a pain, is that when I am dimensioning a sketch, if the symbols are visible, it seems to preferentially choose these rather than the lines/arcs I'm trying to select. Why on earth it doesn't exclude these entities when the dimension command is active is byond me.
John H