I would say that your description is indeed of someone who's "more productive" > code [...] is much more sophisticated and gets a lot more work done > [familia

I would say that your description is indeed of someone who's "more productive" > code [...] is much more sophisticated and gets a lot more work done > [familiar with] more and more libraries > I've [...] learned more tips/tricks/shortcuts I'd even throw something like "code is closer to correct on the first revision" into the productivity column.