FWIW, your particular example is doable with vanilla Vim with the same efficiency (with less strain)
V<count>j (3)
:'<,'>norm A, (8 - The angular brackets are automatically added by vim)
Vs qq (2)
A,<ESC> (3)
q (1)
V<count>j (3)
<CTRL><Space> (2)
As an example, say I need to add a comma to a bunch of lines. I will record the macro on that line appending a comma to the end, visually select all of the other lines to copy the macro on, and then jam my hotkey to apply the macro.
It's often much quicker than reaching for a regex for short segments of code.