I would love to be forced to consider only one item at a time inside of a given list (looking at you, my Someday/Maybe list). Every week I end up just giving each item in that list a cursory glance instead of actually considering each one on its own, and I think the design of having every task visible at all times makes it easier for me to distract myself (oh, look at that other task, that’s much easier to process, forget about the one you were currently looking at). Brain takes the path of least resistance it seems.
How this would work ideally, in my head: I’m inside a list, say Someday/Maybe, I press f and I’m now only able to see a single task at once. I then have to decide there and then whether I want to move it to “Next Items” (n), modify it in some way (m) or delete it (d). When I’ve pressed a button I move onto the next item and can then only see that one item, until I’m done with the list or I press Esc or something.
I seem to remember David Allen talking about the importance of considering one thing at a time. While it’s generally very useful to see everything all at once, I think for the “Processing” GTD step it can feel overwhelming, especially during the weekly review when the number of things to consider is at a peak (at least for me it is).