[PeCaN]

I considered multiple selections a bit of a gimmick in sublime text and various emacs/vim extensions but the way it works in kakoune feels completely different.

Think about vim (and kakoune) as basically a highly interactive language for editing text. At least at a conceptual level something like diw is basically a function (d) applied to data (iw). Vim is completely scalar. The type of all the functions is more or less something like string → string. Kakoune is the APL of text editors. Multiple selections are an array of strings to operate on. It automatically maps the function (editor commands) over every selection. I find this extremely attractive and powerful.

At least for me kakoune blows all other editors out of the water. It really is quite good.