Forget macros and multi-cursor. (Regex) substitutions from vim's command line replaced 98% of my editing needs and rendered a lot of my vim-fu useless.
(Just like searching with / replaced 98% of my navigation)
Editing something without having to actually place the cursor anywhere is a killer feature
Also neovim can show you your substitutions live, no need for a plugin anymore. It's the default.
Word Bro! Regex is so simple to read and easy to get right... and its like if Immanuel Kant wrote find and replace, yeah, learn a new language to do a single function... yEAH! 98% Bro! I'd marry Regex if I could (but if we got divorced it would be my exregex [which is almost a palindrome!] Bro!)
Bro, not every guy/girl is a regex master, multi-cursor is a much better UI/UX wysiwyg editor for everyday users.