Using kakoune for the first time made me understand how much better the vim keybindings could be. I switched the weird begin & end of line navigations (0 and $) to (gl and gr) as they are in Kakoune, and I also added the move view (v* in kakoune) commands to vim.

Also my goodness having built-in multiple cursors is fantastic. Kakoune multiple cursors is much much better than the vim plugins for multiple cursors.

As other people have said though, there are some plugins that have yet to be ported to kakoune. iirc smooth scrolling (comfortable-motion) and vim-wiki to name the ones that come to my mind.