Depends :) Maybe you are awesome in managing all that in your head (which would be an exception to the norm). Or maybe you think you are handling at pretty well, not knowing how much better you could handle it. I noticed you only referred to work. GTD is a life-centric system, valuing personal stuff as much as work stuff. Some people use all their brain powers to manage all of that, and then have very little less to keep up with the responsabilities/expectations that are part of a healthy personal and family life. That, for me, its what always made GTD stand apart from other systems.