Actually, I think the main page is directed toward those scientific users who create their own custom projects and/or libraries. This also goes back to your earlier point in that early in a language evolution you need more library and package creators so you can have a broad ecosystem for the more day to day programmers. One example of this need, is the creator of the fftw library (a cornerstone fft implementation in C) wrote several popular packages for Julia. I think there's a talk he gave at the 2014 JuliaCon.
In this regard, multiple dispatch is actually a huge selling point! I've written in Fortran 90 code, C, Python, and enjoyed most of those languages. There is something unique about being able to pull up the source code for almost every operator/function in the language, implemented in that language. Fortran has this, but is much more statically oriented and difficult for quick scripting. Python, well I'm hopeful pypy keeps building momentum. Or perhaps Pyrhon ported to web assembly, in more pure Python.