Patriots don't run pick plays, they actually block defensive backs before the ball is half way to the WR on those screens. The O-Lineman also immediately run downfield and block. It amazes me every time I see it and I begin to wonder if the NFL changed Fe rule or something. I think it's just a case of Belichick pushing it and pushing it until the refs will actually start calling it.
The rest of the league has to start running these plays as well, because its pretty much impossible to stop in certain coverages.