Well, there are some other people who don't cover up their face in their superhero identity. The first that comes to my mind (apart from anybody in the Superman family and Wonder Woman, Wondergirl/Troja (Donna Troy) and the later Wondergirl (Cassy Sandsmark) after she is outed) is, well, Zatanna. Then again, she doesn't even bother with a secret ID.
I'd also put the Martian Manhunter in that category, although the form he uses in that identity is some kind of cross between his true Martian shape and a human shape. (No idea what exactly that is supposed to mean, honest.)
There are also some Marvel superheroes who don't disguise themselves: The Fantastic Four, some (or most?) X-Men, Thor (and I think a couple of other Avengers, too)...
