Siva -
Sounds Very Good
This is very similar to what Anthony Robbins espouses in his O.P.A./R.P.M. methodology.
In brief -
1) DUMP your brain of all the "flying thoughts" or "oops, yep, gotta do that, should do that, etc..."
2) Make a list capturing (or in GTD = Collecting) all of those "baby steps" or "to-do's"
3) Identify the OUTCOMES (yes, this part resonates with GTD quite nicely) that you want for that Day/Week/Month (depending on what type of planning you are doing)
i.e. - Physical Fitness: "Become a stud-muffin"
4) Identify the "Must Outcomes" that you want for that period of time - if nothing else were to happen, you can go to sleep knowing you achieved these.
5) Go back to your original list of "to-do's" and put a "*" next to those tasks that you know are key to moving you toward that outcome (maybe only one or two out of the five that you "dumped" from your brain. The others may or may not have to happen, you may be able to "leverage"/delegate some of them ("WaitingFor's") - depending on what happens after doing the two "musts."). I believe there is also some handwritten "shorthand" that you use to tie it to the outcome.
Robbins' goal (and whoever else may have helped him design this system) is to keep you focused on the "Higher Elevation" Outcomes every day/week/etc... not get bogged down in, or overwhelmed by the "minutia" that may or may not have to happen to get that outcome.
To paraphrase - 5 outcomes for the day is easier and more natural to remember than 30 "to do's"
At the risk of being presumptuous - IMHO, I believe David Allen's goal (or outcome, if you will...) is to keep our attention on the Higher Levels of Elevated Focus as much as possible. The "Next Actions" lists, and the Workflow Processing system is not where our attention should END (and they're not the "finish line" of the race); and not what we should be worrying about "making perfect." They are the "grasshcatchers" or the "bulletproof system" to make sure nothing slips through the cracks, so our attention is not SLIPPING back to the lowest level of thinking, the mental static of "oh yeah, gotta get batteries." The Lists & Workflow Mgmt are the "starting line" of the race, if anything...
* That my actually be why not TOO much attention or "worry" is placed on "The Lists" - re: due dates, priorities, etc... GTD may not want to use too much energy at the lower levels - IMHO.
.and of course, you can see parallels between this and other "Time/Life Management Systems" as well....
But I DO think using your Calendar as a place for "Higher Levels of Focus" resonates with the whole GTD philosophy quite nicely...
I hope there was some added value in all of this for you
(..and all of this typing on only one cup of coffee - wow)