To answer your question Paul...
Great question, I love that you brought that up!
I thought about it and an aspect of GTD that seems to be automatic at this point for me, is doing things that can be done based on where I am. For example, I find that immediately when on line at a Starbucks or anywhere else I have down time, I go right into my system to see what I can get done, based on my context. It has become second nature to me.
Another is mindsweeping. I tend to do it very often (not just at Weekly Review) but several times throughout any given week.
How about some other long time GTDers???