Yeah I'm with you targo, I've talked about it on my blog, about the fact that with an xNTJ in my life, everything about my life tends to be better, more productive, and I become positive in every sense: as a person, in my mood, in my impact on the external world, and everything generally. Without one, I'm like an aimless drifter and just get myself into trouble, and eventually become depressed because of the clash between my need to feel useful, and my lack of ability to motivate and discipline myself into doing the things that would lead to my feeling useful!!
I've never really had to stick to schedules, having been self-employed in a job where, so long as things are done by a deadline, I can choose when to work on them and how etc. However, when staying in monasteries (which I do frequently), I find I respond to the routine there very well, it seems to really 'make' me.
I don't think being a P is as much about not needing structure or organization, as being not naturally inclined to seek or create it. The same can be true in reverse: being a J isn't about not needing to relax, chill out and go with the flow, but more about not being naturally inclined to do so.
Pe/Ji types (extraverted perceiving/introverted judging) by definition specialize in plugging into the external environment and going with it, making your own 'sense' of it as you go. You can't really do that at the same time as its opposite of Pi/Je, or plugging into your internal environment to look for what you know already and applying it to 'control' the external world in some way.
For Pi/Je types, non-intervention and 'waiting and seeing' comes more naturally, and that policy is applied to the self as much as to the external world.