Matlab's strength does not only lie in the simplicity of it's code or in not having to load libraries explicitly. It also lies in the fairly good IDE. Built for scientists who want to prototype code quickly, there is an interpreter and an editor right there for you. Not to mention that you never have to configure anything, it just works.

I love Julia, but for wider adoption, it will definitely need integration with a good IDE that "hides complexity from it's users".