I've used, and abandoned, GTD many times. I've also used the following:
Originally Posted by dadalus
Wishcraft - B. Sher
7 Habits - Covey
Getting S**t Done - B. Westterman
AF, DIT, DWM, etc - M. Forster
I've tried, and own, a lot of Mac productivity software, and continue to dabble in analog productivity (creating my own pages).
Here's what I've discovered... there's a kernel of truth in all of these things. There's also a lot of hype, over-promises, and silly slogans.
A few suggestions:
1. Monitor your time without using any system (Do this for a week)
2. Montior your time using one system (Measure for at least two weeks)
Do you see a difference in how you're spending your time?
Journal about your feelings, what you've accomplished, etc., at the end of every day. Introduce a productivity habit, and see if your entries are telling a story that you're proud of.
Currently, I'm using a tiny bit of GTD methodology, mixed with DWM rules, and Omnifocus. I'm here because of the deep resources and thoughtful/helpful people. The support alone helps keep me focused and motivated.
Finally, if you're looking for criticism about the GTD process, this forum ain't the place to be There's a ton of folks reworking the GTD process, some claiming the entire methodology is flawed. Here's one opinion