I love GTD. I discovered it in 2007 and have been using it faithfully. I read the book. As I see it, GTD comes down to this:
1. Capture everything.
2. Make a decision of what to do with it.
3. Get it in your system (which is probably a calendar, tickler, some waiting-for/action lists, with a project list to keep track of bigger things, and some reference areas like an address book, shopping list, and filing cabinet).
4. Do it.
5. Repeat steps 1-4.
6. Weekly review of your inbox & system to make sure you know what's going on in your life, and that you didn't miss anything.
There's runway-to-mile-high stuff, etc, but to me, those steps are the nuts-and-bolts of GTD. It's really simple. That's what appealed to me. It's so simple, everything"fits" into this process.
So how did we get from a few easy steps to a book series, web portal, coaching sessions, forums, kits, summits, corporate initiatives, and software? I feel the same way about the Pomodoro technique. Is there something huge I'm missing here?
(No disrespect meant to David Allen. It just seems like GTD has a life of its own.)