LaTeX is still very much in favour in my field of geophysical research. I believe that the same is true across most fields that rely on mathematical notation to explain things in written form. I've never found it difficult to write in a non-WSIWYG system ... indeed, it is really quite convenient.

Years ago I had a student in my class who was unable to make out written material, but had a machine that read text aloud. My class notes (some 300+ pages) are chock full of mathematics. I went to the student's house to see how that reading machine worked. Provided with LaTeX input, it said a lot of things like "backslash alpha" and "begin open brace equation close brace" stuff. I wrote a quick perl script to change it, so it said "alpha" and "begin equation". Presto -- it was exactly what the student needed. This was, as I say, many years ago. Maybe now there is software that can handle MSword files, etc., but that definitely did not exist at the time. The result? The student was able to take the class, and did very well in it.