You might be right with conference papers, since many conferences will prefer LaTeX submissions, and besides, such papers are often prepared by students and young researchers, who tend to be more "geeky".
However, in my experience (I've worked at a CS department at a Dutch university for over five years until last year), a large majority of professors/faculty/permanent staff/you name it prepare their documents in Windows/Mac environment, and will only tolerate LaTeX and such if they themselves don't need to edit a single line of it.
A tendency I have observed is that the more senior they are, the more Windows-only they get. Kind of strange when you consider that many of the ones I know have physics background, and physicists tend to be down-to-earth people who favour simple tools they can understand.
A cynic inside me would say that the more managerial responsibilities they have, and the more contact they have with business people and with big research money, the more Windows-loving they become... Coincidence?
Also, even among the LaTeX users, PowerPoint is a de-facto standard for presentations. I could count on one hand the people I know who use something else.
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