I would say an important factor is free choice of editor. I can work much quicker with vim than any other editor, others might have different preferences.

When I work with WYSIWYG editors like Word, I often find myself struggling with unwanted text selection behavior of the editor, formatting issues, program slowdowns due to high CPU usage and the like.

It's faster for me but not for everyone. It depends on what you need.

For complex documents, I resort to LaTeX whenever I can (collaboration often makes Word/Writer mandatory). It's still faster for me than using WYSIWYG unless I'm trying to create something with few text but with heavy formatting. Then, I might prefer Scribus or Illustrator, though.