julia-emacs VS crux

After that for basic julia support you'll probably want to install julia-mode. There's instructions there in the readme about installing it from melpa. You should be able to just add those lines to your init file after (package-refresh-contents).

For those still on 28, crux-rename-file-and-buffer does the same thing (https://github.com/bbatsov/crux). I've been using it for half a decade at this point. This sort of command, that no other code will rely on, was never that important to get into core, and there's some merit in making people create the commands they needed. It's not like with the additions to subr and subr-x libraries (string-replace, string-search etc), which can't come fast enough.

Use vc-rename-file or crux-rename-file-and-buffer from crux

A similar functionality is in the crux package (see crux-delete-file-and-buffer).

How about https://github.com/bbatsov/crux?

Some packages I use for more effective text editing is crux for general text editing (video on crux), paredit for lisp editing and for org-mode:

I'll go with crux. It's not all about text editing, but it's got a lot of commands in dwim-fashion.

I learned the syntax of org-mode in an hour (maybe less), It has many superiorities to markdown (see this excellent essay). Emacs is a fully-featured tool, it's a lifetime of learning, just like all extremely powerful tools, you can see the blogs of many emacs experts like Bozhidar, Protesilaos, Karl Voit (to name a few) learning new features of Emacs quite regularly.