I use (Neo)Vim which only has minimal Lisp support built in. I started using Parinfer and it made a huge positive impact on my experience writing Lisp. It would probably be less impactful if I already had a good workflow and keyboard shortcuts that I liked.

But Parinfer is particularly nice in that it makes not just editing easy, but also refactoring, which historically was one of my big annoyances with s-expressions.

Maybe Paredit has features for that too, but I didn't use it (the Vim port) long enough to learn its ins and outs.

I'm a vim user and generally dislike tools typing for me at the same time that I'm typing. I've gotten some value from https://github.com/tpope/vim-sexp-mappings-for-regular-peopl... though when writing Lisp.