First: I love GTD. It has transformed my approach to work and life, and I believe it has made me much more effective in making things happen.
However: I think it is making me become prematurely senile. By writing everything down and keeping thoughts out of my head, I think my brain wiring is losing short-term memory ability, through lack of practice.
Anyone else experienced this? Or, could this just be the long-term effects of youthful indiscretion?