Why not carry the editor over into the Widgets? I can't believe this isn't already a thing, actually.
(I just started really using WP and noticed that as a client mentioned that there was weird "text" in one of their widgets. The weird text was a hyperlink I hardcoded in at some point but I didn't really pay attention, I just thought I was in the HTML view of the editor or something.)
I also can't believe that this idea hasn't been proposed before but I can't seem to find it with my search terms.
