Sadly, this summarizes my experience with GTD in particular and other organization techniques in general. If I have someone else telling/advising me how to organize my space and time I get hopelessly mired in the thrill of "figuring it all out" and in the possibilities for trying out an endless list of software options to allow me to "maximize" my effectiveness and efficiency. Buffalo chips! My solution to getting things done for myself has beeen to knuckle down and get things done (pun intended). Period. Without any aid other than a calendar, notebook, and a pen. I combine this with the tasks and calendaring features of Outlook 2003. So far, I have been doing pretty well.
I'd LOVE to say that I benefit more from trying out various methods for organization, but they just distract me from whatever task I was hoping to get done!
Rant over, and out