I have a hard time believing this, to be honest. I know far, far more people who use Microsoft Word, than I do people who use (or even heard of) LaTeX.
It depends on the field. The field I am working in (computational linguistics), virtually everyone uses LaTeX. And with good reason, there are great packages for typesetting stuff that is specific to our field. So, yes, at work I know far more people who use LaTeX than Word.
And you never stopped to investigate why, in spite of the far greater ease of entry that alternatives have?