Thanks. I have heard a lot about GTD but never sat down and read it. I definitely want to read it one of these days but I also must say that after years of trying different productivity systems I find that the absolute simplest systems are the best for me.
GTD is supposed to be a pick and choose the parts that will make the most difference in your life and adjust to what works for you. If your not "a manager with a wive and kids and maybe a foundation to run on the side." then you don't need the full, but there are often useful things in there that are useful.
GTD is not religion (or at least it should not be - with some people it is), you won't go to hell or something if you don't do everything perfect.
I'm not a manager, but have a wife and kids and used to run a foundation on the side. The overhead of GTD only got more painful, while my ability to sustain focus diminished, so the whole thing broke down.