Somewhere I came across a description by David on what GTD black belt could be like. There are two levels, first and second degree black belt, and the second degree is short and sweet and reads:
I think "someday/maybes" are a big key to getting there, because they allow you to distinguish the things that would "blow up" if you missed them, from the rest. When I make something a someday/maybe I will make clear to myself that if I never do anything on this, it's fine. If I don't look at that list ever again, nothing is going to blow up. On my projects and next actions lists I will endeavor to only keep the very few items that have "consequences" if I don't do them. Those consequences can be personal, but will be felt.Time has disappeared, most of the time. You often move fast, but you're seldom busy. When you're playing with the dog, you're not thinking about any of the big stuff -- you've already thought about it. You know what every key in your desk drawer is for.
I have one "someday soon", which I review weekly. Those are things that have consequences, but it's not time to start yet.
My someday/maybes are sorted into different lists to make them more accessible. For example, I have a hobby list, which I can look at for inspiration on a rainy Sunday, and a list for vacation ideas to look at when brainstorming ideas with my husband for what to do next summer.
By maintaining this clear distinction, I will know when action is imminently required and when I can abandon myself to playing with the dog.
All the best,