BC (before computers) I always did first drafts by hand, usually on legal pads, skipping lines to leave lots of space for editing/revising. My thinking always slowed down and froze up sitting in front of a typewriter, manual or electric. I'd write out first drafts, do a rough edit by hand, and then type up that draft and scribble all over it for the next stages of revision.
When I confronted a computer/word processor for the first time, I assumed the process would be similar and distrusted starting from scratch with a white screen (blue in those DOS days). And then I discovered an oddity, for me, somehow the computer is almost as fluid as the pen, and far easier as a drafting medium that a blank piece of paper in a typewriter ever was (at least for me YMMV).
So today I tend to use both paper/pen or computer/word processor interchangeably for drafting and writing, depending on the circumstance or particular situation. I do not miss the typewriter/whiteout/correction tape days at all.