That helps me overcome my biggest worry: that I finish something, tick it off the list with relief, and then forget that there's more to come.
I think a lot of people feel the need for "safety nets" in their system, and that's absolutely fine - I do it all the time. But I also reiterate the importance of the Weekly Review, which according to David is really geared towards the 10,000 foot, Project level. You can't "forget that there's more to come" if you are reviewing every project each week for completion or further action needed. I don't think the usefulness of the Weekly Review as THE key to banishing most niggling thoughts can be overstated!