My bumpy start with GTD but I'm flying now
I bought "Getting Things Done" during a lunch break, with the aim of organizing paper stuff, mostly. Then I realized there was a lot more about GTD than that, and I went crazy organizing my home for a few days. But everything was about physical stuff, at first, not the mental stuff. Then I started managing my email differently. It took a while to start mind sweeps, setting a system, and doing a weekly a review.
I rushed into various Mac software apps. I didn't have GTD down, conceptually, and the software made things burdensome and complicated, and counterproductive. I kept switching software and scrapping my system and starting over. Finally, on a business trip that had some down time, I created a paper system based on moving Post-It Notes around a nice notebook. it was physically cumbersome and only lasted a month, at most, but I conceptually got the workflow this way.
At that point, I returned to Things software for almost a year. Eventually, though, I found it was not powerful enough for what I needed, and I returned to my original purchase, Omnifocus. The Set-Up guide had come out, by then, and it helped tame that wild beast. It's really brilliant software, and now I use it on my MacBook Pro, iPhone, and recently, iPad.
I have evolved in using OF, though. I used to keep everything in it, including several Someday/Maybe lists that included over a hundred movies and books, for example, in separate lists. I also tried to make it be the place for my higher altitudes. Ultimately, and recently, in fact, I decided to remove those from OF. Now OF is streamlined and only for my current Next Actions and Projects. My Someday/Maybe Lists are in documents kept in Dropbox and available via the 'net, my phone, and iPad.
I have also evolved into a much more sophisticated GTD'er. Once the runway-projects were under control, I started to THINK differently. Of course, there is the "what's the desired outcome and next action?" part of it, but so much more, too. If I'm stressed, I do a mind sweep. If I'm partially watching TV, I keep a pen and paper nearby for a lazy mind sweep: I don't actively pull for thoughts, but let them surface on their own.
I use my lists differently too. I am much more critical of them, in the sense of really asking if something needs to be on the list. I am amazed by how much I drop from the lists, and feel fine about it. I need to be 100% committed to something for it to be on my lists (not counting my someday-maybe lists, that is).
Another evolution is my ability to think at the higher altitudes without a sense of overwhelm and stress. I'm certainly nowhere near the clarity in all of my higher altitudes as I wish, but they are slowly forming. My life is getting to be more meaningful and I have a greater sense of being able to create my future than I ever have experienced.
I could go on for hours about this topic, but I'll just add one more observation. I make decisions much more easily, and do not second-guess them nearly as often. I feel "completeness" much more than ever before, and let go of the past and live in the now, more, too.
So from organizing my files, to straightening my closets, I've come quite a long way with GTD.