They are. And have been since the 1970s, and will continue to do so for another 50 years.

Particularly the fixing bugs parts. So often is one bug manifested across 200 lines in 50 different files, and to fix it you need the same 5 exact keystrokes across those 200 lines. vim (or in my case Emacs) macros will allow me to find the fix in the first of these lines where I also define the macro, and then apply in mere seconds across the other 200 lines.

As for writing test cases, copy-paste has worked fine since unit tests became popular in the 1990s, and will continue to work fine for the next 30 years. editor macros are not too dissimilar to copy-paste-edit.