PG's essays are consistently great. Although in this case, I disagree with the central thesis that the history of philosophy is merely a history of confused talk. Certainly, a lot of philosophizing (especially OLD philosophy) commits just this sin. But that's not to say that philosophy as a methodology is inherently broken, that one has to be caught up in the muddle of confused language. In fact, my own study of philosophy has taught me that philosophy, at its best, clearly lays bear the ways in which language confuses us. Philosophy, then, allows us to transcend the little confusions that pervade our everyday language.
And what PG comes to saying, that philosophy should change people the way we go about doing things, is essentially a reworded statement of the Pragmatist's ideal. Peirce, James, and Dewey said the same thing a hundred years ago. PG is right to stress this idea, but if his claim is that philosophy is not sensitive to it, he's just wrong.