And he did it again that day, and made a bit more progress, and learned a beautiful proof for Weierstrass's theorem using the induced sheaf cohomology of the exponential sheaf sequence. Joe decided to use Windows XP -- he didn't want to think about all that lisp stuff today, and having nothing but Internet Explorer 6 (Joe only reads one page at a time) and Notepad to do his work with, he wrote the rest of his Latex notes in Notepad. And he felt happy, and went to bed -- which wasn't a bed, just a floor, as Joe was really a minimalist sort of guy.
How will Emacs enhance his experience (in any broad sense)? He doesn't compile often. Come to think of it, he probably doesn't need the preview-latex function either. In which forms do these gains come for him? Generally, what is the least complex form of editing that Emacs can still produce gains for?
C-s or C-r, type a few chars, <Enter>, continue editing
 since he is on Notepad at the moment
Any data formatting and parsing is extremely simple and easy, since this essentially becomes programming by doing. Much quicker than any other method I know and awesome for the many, many quick hacks one needs throughout the day.