Imagine you are driving with a friend who is giving you directions from passenger seat. He might say something like this "turn right after 3rd traffic light" or "take next turn". This is not how GPS navigator would instruct you. You more likely hear "in 300 feet take right." But for humans it is easier to count traffic lights or intersections than to estimate a distance in feet or meters. Can't wait for new navigation software to catch up.
And while I am on the subject of navigation, here is another annoying feature I have noticed in Google Navigation while driving in France: it reads French street names using English pronunciation rules. When read this way they sound funny and are difficult to recognize. I think it should be smart enough to know than even while my language is English I am driving in France and names of the places should be read in French!