I've been absolutely loving treesitter. It's come a long way and it's been absolutely great for things like folds, motions, highlights of course. Now that I've finally gotten familiar with writing my own queries I can extend the existing plugins. As an example I've added folds to blocks of multiple consecutive comments in JS and Ruby.
well, i eschewed motion plugins for so long, but i recently installed easy motion, to quote "maybe use it minimally so i don't have to change my work flow too much". i pretty much gave up using w, e, b and f within a day of installing it, replacing each of them with a more efficient reach for the same number of key presses. similar situation with ultisnips, thinking it'd be overkill for my needs. in other words i was worried it would save me TOO MUCH time pffft. these both work really well with opening zsh commands in $editor too.
The big ones from that are CoQ (fast as fuck autocompletion using neovim's builtin lsp) it's artifacts for commonly snippets and ChadTree (nerdtree replacement made by the same person) I rely on both way more than I'd like to admit and they take neovim from a nice text editor to something that can rival any IDE for me.