Thanks for making your configuration available, I want to try out Neovim because it's an exciting project and having carefully constructed configurations available as a starting point will make it easier. Your configuration doesn't look too long to me, my own Emacs configurations are much, much longer and not at all stable--every so often I declare Emacs bankruptcy and start over.

Now, some off-topic musings:

I switched to Emacs from vi in the 80's, and I put up with it for the many powerful packages it has. Lisp as a configuration language has served Emacs well for decades, but I've always been aware that it narrows the number of contributors to those that are comfortable with Lisp. Progress towards modernizing the Emacs extension language has been slow...and it will still be a Lisp like language (Scheme).

I'm rooting for Neovim and I'd like to see a project like this for Emacs that would modernize it's UI, UX and underlying extension language. This will likely never happen while I'm still programming. Imagine the difficulty of recreating just the org-mode package!