Telescope feels so game-changing, and I've not found anything like it outside of Neovim and Emacs. Being able to fuzzy search a buffer or my project instantly makes navigation insanely fast.

People talk about not needing to type fast when coding, but I do need to navigate quickly, especially to not lose context while thinking. Ivy/Helm/Telescope with one of the various jump libraries (and LSP of course) makes code navigation feel second nature.