My recollection is that the main speed advantage lay in being able to copy-paste the previous line when working through a derivation. I live-LaTeXed notes for

My recollection is that the main speed advantage lay in being able to copy-paste the previous line when working through a derivation. I live-LaTeXed notes for a couple of years in undergrad but eventually went back to pen + paper (approximately all my assignments continued to be typeset, though).