I found GTD too heavy for me.
Guess I'm not that busy of a person. Maybe if I were a CEO or something.
Anyways, it was just too much work, I kept not doing it, and, like the above poster, kept needing to "get back on the wagon."
Once I finally admitted that, I started doing a lot better. I ended up going to a "Simplified GTD" system first explained by Gina Trapani of Lifehacker here:
http://lifehacker.com/335269/practicing-simplified-gtdI ended up taking that idea as my core and tweaking it to fit me. I don't do reviews that often (certainly not weekly), but I have a few basic files (mostly the 3 she describes).
That, combined with Inbox Zero (the concept of never letting the inbox fill up, I generally have one email sitting in my inbox, the IDoneThis email of the day that is sent to me each morning - if an email sits in my inbox, it doesn't leave until it's dealt with, usually right away, the longest a day or two), and then
IDoneThis to track everything I've done in a given day, give me the best organization system that works for me.
(Oh, and I use Evernote for my long term notes and lists, and then SimpleNote for my GTD system only - I found it best to separate them, hated having GTD lists cluttered in with other saved files.)
If you've tried GTD (perhaps over and over) and couldn't stick with it, try the modified GTD above. It's surprisingly good for those of us that don't need the full blown system.