OK. Here's a usecase where I found emacs to be wonderful.
I had to email the grades, together with totals, and class averages to many students in a class.
I tried fiddling with Excel and Google spreadsheets and scripted mail merges. Then I realized I could do it emacs.
Export the gradesheet into csv, and convert to an org table.
Carefully record a macro where you copy paste the name of the student the mark columns into a mail window (I used gnus), copy paste them into a calc window, do the calculation, copy the result onto the mail, and email the student. Go to the org buffer, and go to the next line. This took about 12 minutes to get right.
Keep pressing f4. Sending individual mails to 125 students took Maybe this is overkill, and I am sure excel wizards can do it in a few minutes. Nevertheless, I was surprised - if you spend time carefully recording the macro, the Emacs ecosystem (org+gnus+keyboard macros) is insanely powerful.