While this is a beautiful interface, I often read things like "traversing a long source file trying to look for a specific method’s implementation" or "sick and tired of having to scroll through a raw copy of jQuery..." and am confused. Why don't more people use their text editors' search functionality to find a specific piece of code? I never find myself scrolling through long source files.
Ideally one could use a proper IDE for this purpose but then OP has touched a good point; and IDE higlighting the calls of methods those are declared in the module would really help in understanding the source. I'm definitely stealing this! Thanks.