In my experience, the problem most people have with writing is that they start typing before they have a clear picture in their mind of what they want to say, how the want to say it, and the order in which they want to say it.
Agreed!
I approach technical writing as a construction task. I collect the points and details and images that are important (usually using a separate scratchpad text file with a sentence or paragraph each, with any related citation references if academic). Then, I consider the structure, and what kind of sequence and approach I believe will work for the readers/listeners (based on what I personally prefer, really). Only then do I start really writing.
I blame a lot of this on modern word processing: it's far too easy to simply sit down and type, backspace, copy/paste, etc. without first spending sufficient time "grasping" or organizing the material.
For over a quarter century, I've fought against teaching people how to use a specific word processor like MS Word –– exactly because it leads to them doing that, taking the quickest options and shortcuts without learning how to use the tool in an organized fashion making them more efficient ––, and to switch to teaching them how to use our word processing technologies to
assist them in technical writing.
Initially, I started by explaining that the way the text is laid out is best managed using the conceptual
styles –– heading, body text, listing, etc. ––, and not by picking a font you like from the convenient drop-down menu shown, so that their output would stop changing the font mid-way. Then, I showed how the other related features like page header and footer can be used to add page numbers, and how using the proper style for headings and figures, you can make the word processor generate the indexes for you automatically. However, all this is for the
writing part, not the construction part.
Most word processors like MS Word and OpenOffice/LibreOffice Writer do have an Outline view or Navigator, so that if one uses descriptive headings, one can move them around very quickly in the Outline/Navigator view without having to cut-paste the actual text. However, I think using the same tool for the construction tends to 'push' the user too early and too easily into 'writing mode', so I do prefer using simpler, cruder text editors and interfaces for the construction part. Sometimes even Post-It notes on a window/door/wall just work better.
All that said, I'm not an author/speaker/presenter. I've only made a couple of dozen presentations and talks along the years, and while they've gone well and sparked interest and interesting follow-up questions on the topic, I put that mostly on the topics themselves, and not my presentation/formatting. (And no, I don't tend to overshoot my allotted time, unlike in writing...)