[aqsalose]

>With mathematical homework, aren't you spending significant time ensuring that what you typed into Latex rendered correctly?

>[..]

>I could see it working for a lab report.

I think here is your answer: much depends how much your homework is like a lab report. I have occasionally had courses where the were only a few homework assignments and lecturer expected written answers typeset in LaTeX (or similar).

But I wouldn't bother either if I was the only person who would read my written notes.