I had an amusing moment when I walked into the office this morning. I looked at my inbox and found a note from the previous evening. Someone had called just before I was about to leave the office and asked me to do something for them - obviously I grabbed my notepad, took the details down, and tossed it in my inbox to be processed first thing this morning. But just for a second my brain was surprised to see the note in my inbox!
I trust my system so well now that I was able to entirely forget about that call, knowing that it had been captured and would be processed in the morning. Pre-GTD I guarantee that a part of my brain would have held onto something, just in case I forgot the following morning.
GTD gives me so much freedom to enjoy life away from my responsibilities, knowing that I have captured what needs to be done and can go back to tasks without the worry of things slipping through the cracks and being missed.