So far for me yes. Interestingly enough since I live in DC - I never had transit directions in Google Maps anyway.

Or maybe it was just me or I gave up trying, they appear to be there now at least on the website, no transit layer to view, but directions do appear.

WMATA finally got their act together and opened their data to Google sometime in the last year or so. They refused to do so for the longest time because, as I recall, they didn't want to lose advertising revenue from wmata.com. Revenue which amounted to something like $50,000/year, out of a budget of hundreds of millions. Anyway, Google is pretty good at DC transit routing these days, at least in my experience.