pvonk,
Your (first) post is provocative, in terms of your use of contexts. Definitely not GTDish, but everything has evolution. I relate to the large number of tasks and struggling with what/how to focus on. Even after many years, I'm still rethinking hard about all this (I suppose many of us are). Here's an interesting approach:
http://teresatorres.com/blog/2009/05...g-my-strategy/