Granted it was 3 decades ago, but when I was in grad school, choosing to use LaTeX seemed to add a few months of effort to the "writing" stage of a thesis. However, it was hard to assign root cause because LaTeX and Word were producing different things. The best technology allowed you to create more, but at a price. Typeset dissertations were beautiful, mine was not.

What LaTeX allowed you to do, in principle, was to "build" your document, i.e., type a single command and have camera ready output roll out of the laser printer. Using Word (or even more primitive tools -- I was on a MS-DOS machine), always required some manual intervention. My workflow involved scissors, glue, scotch tape, and a copy machine. But I got done very quickly once I was ready to start writing.