> I find that I often have a 2 week ramp up for any given programming language.

I agree that a competent, experienced developer can do this. What's worth noting, however, is that it takes two weeks to cross the bar of "can contribute code in this language that produces deliverable results". But two weeks cannot get you across the bar of "can contribute robust, maintainable code in this language".

Even though you are not a beginner to programming, you are a beginner to the language and its ecosystem and so will still make some significant newbie mistakes. Ruby on Rails is a good example of this: half of being good at RoR is being a good programmer, the other half is memorized knowledge of the idioms and patterns of the framework and community.