I'm not convinced of that. It's supposed to be a general purpose numerical language, and doesn't even have a decent native plotting library (gadfly doesn't seem to be maintained and using matplotlib is a hack)...tldr; it has a long way to go.
I hear the normal PyPlot/GR wrappers are pretty useful as well. They're ultimately not native Julia code, but since Julia makes it so easy to reuse tools in other languages, why not take advantage of that feature?