At this point, only Batman and Spider-man continue with the old fashioned concept of needing a mask since their secret identities are so important for their characters. Nearly every live action movie superhero has a public identity or hasn't bothered to use a mask.
Well in the case of Batman and Spider-Man, I'd say the masks are as much for intimidating the bad guys as hiding the hero's identity.
Especially in the case of Batman, whose fierce visage and pointed ears are the most important part of his look. Plus there's the whole vigilante thing and being wanted by the cops...