I'm not sure if SpaceMacs uses evil but it's a similar concept. That being said, I tried learning regular Emacs to see what the fuss is all about and much prefer modal editing to pressing control constantly even with caps lock mapped to control.
Your mileage may vary but if you're already editing quickly modally and have all the features you like in Emacs I'm not certain there's much upside to learning how to do a lot of the same stuff the Emacs way.
Tmux plus tmuxp was a much greater improvement for me. Being able to restart iTerm2 for updates and maintain all my sessions, no rage after accidentally quitting a session, and writing short and simple tmuxp yaml files to launch a whole environment with one command is really awesome.
I enjoy the ViM mode in IntelliJ which I assume is similar to the one in Visual Studio Code, but mostly I prefer the terminal. Everyone loves VS Code that's for sure, so they must be doing something right!
I'd probably actually write plugins for ViM if it used Lisp and in a way I'm kind of glad I don't want to learn ViMScript as I've already spent so much time over the years playing with my vimrc as it is.