Weekly review binder
I am a paper based GTDer and I have a red three ring binder for my weekly review.
I have some lists: Waiting for, Projects, Someday/Maybe and some personal trigger lists that help me stay on top of my game by asking myself reflecting questions.
When something comes up that I need to reflect on during my weekly review, I put a small piece of paper in the hanging file with the binder. I use these small pieces of paper for phone calls, which go in a phone call file.
No, I do not find the paper based system to be wasteful. The paper I use (not the entire 8 1/2 x 11 sheet) is reused. Do you know the white paper which wraps paper towels? That paper can be cut up into 3-4 strips. The backs of daily Dilbert calendar cartoons make a festive workplace. Backs of envelopes, any junk mail that is printed on only one side. I have these small pieces of paper stacked so neatly no one would ever guess that is how I use them.
When it comes to the environment (I am not trying to pick a fight here), who wastes more? The computer based system doubtfully reuses more paper than I do using my system. Recycling is great, but reusing then recycling them is pretty good for the planet in my opinion. Again, not trying to sound arrogant or holier than thou. I am trying to make the case that paper based systems are wasteful.
Good luck with whatever system (or combo) works for you,