I use Visual Studio Code. I’m using the extension: vscode-elixir, but my favorite theme GitHub-plus-theme is not good enough for Elixir, I try to make an adapted elixir version, welcome any suggestion.
PS: you can search keyword “elixir theme” in VSCode Marketplace.
Just mentioning, moved from vim to spacemacs and didn’t miss vim at all, but then moved back to vim again and didn’t miss spacemacs.
So since spacemacs was kind of 10 times slower to startup and 10 times bigger in RAM, stayed with vim. 
I’m surprised there aren’t more users listing NeoVim. It’s a drop-in replacement for Vim with async plug-in loading and what I’ve found to be more accessible documentation
I use NeoVim for Elixir because I needed an editor when alchemist (with Spacemacs, not important to the malfunction) suddenly stopped doing goto-def and documentation lookup correctly. I can vouch for it being super solid and right now it’s looking to be my main editor with Spacemacs as a close 2nd.
The truth is that I basically maintain configs for 5 editors/IDEs because software is hard to make work on everyone’s machine and there’s always a “best editor/environment” for the language you’re using.
I am using an atom now. but in the near future I’m thinking of starting to use alchemist.vim.
