While I don't type lightning fast (~130WPM and beyond), I already type without thinking about it. I just think and it appears on screen, actually. On the other hand, when I'm writing, there's another sub-process which is evaluating whether what I'm writing makes sense or works in real world. It's not possible to do this while typing since the freedom provided by the pen, and the thinking process is completely different. Also, I can build a model of what I'm writing about in my mind better. In short, typing lends to shallower thinking while writing allows more depth and exploration on the subject.
This is also evident when I'm writing code. I design it on paper, and type that design to the IDE I use.
The research articles I started to collect also points to something similar. When using pen and paper, neurons fire differently and in larger networks, pointing to a different mode of thinking. Considering I started use pen/paper and keyboards almost at the same time, and able to verify that using a pen really makes my brain work differently, I find "you're typing it wrong" a flawed argument for the most part.
The sub-process thing sounds vaguely plausible, but at the same time, I'm under the impression that I'm already constantly evaluating whether what I'm writing makes sense, its implications and assumptions, etc. At least I feel that I'm attentive to the impression of it not making sense, though I also try not to confuse the feeling that something makes sense with the fact of it being so.
Anyway, what I'm going for here is, did you consciously apply any technique or process to evaluating this or do you come by this insight naturally?
Another thing is, even though I have a very good to-do system backed by a nice software and allows me to see what I'm doing forward in time (application is called Pagico, BTW), I always keep a notepad nearby and automatically offload some information onto it. I tried tons of fast-note applications. On-screen sticky notes, notational velocity and friends and whatnot. I always return back to pen and paper and live better with it.
Well, the notepad I'm currently using is labeled "#14", and this is after the fact that I started numbering them to be able to index them. So, by both trial/error and intuition/insight, I always return to pen and paper.
Same for my diaries. I have an encrypted diary on my computer, yet I still use my paper one(s), and the digital one is a backup in case I really need it, and I don't have the paper one with me.
Hope this answers your question. If you want to chat further into this, you can find ways to contact me starting with the profile page here.