^ Well now Batman doesn't have to do that thanks to Lucius Fox's new smart mask he designed
The web-shooters over time have been redesigned and tweaked by various artists. The original Ditko one's were pretty large and clunky. I assume the metal alone would have been heavy on a normal human's writs. The web-shooters now a bit sleeker and less clunky and the tanks are smaller looking than they used to be. I don't have a pic with me or else I'd post it.
Off topic a bit...I believe Marvel released this pic and the Captain America one (even though that wasn't official but from EW) in response to DC's Flashpoint teasers, maybe not direct response but at least to generate discussion of their own properties.