That's actually a pretty good barrier to entry. With emacs/spacemacs, if installing it is too frustrating for you, then configuring and using it is going to be way too frustrating for you.
My opinion is that emacs/spacemacs is more optimized for day to day work, than for the out of box experience. Personally, I'm fine with that, and there are some great editors (like sublime) that work out of the box if you prefer that.
However, the people generally working with/on emacs are not looking for that, they are looking for an editor optimized for customisation. They have already gone through the experience of setting it up, so why would they spend most of their time making it easier out of the box?
There is a cost to everything, and so far most people on emacs side have decided to spend their time on improving it's power, not it's ease of use.
For the most part it is completely optional to configure it and use elisp... it will ask you if you want to install a layer (group of packages) when you open up a filetype that it knows about and can handle. there is some configuration akin to setting up completion backend, linters, formatters etc that are applicable to your language/filetype of choice. The benefit of that is that the external tools are kept external where development of them can continue unimpeded by the development of the main text editor.
similarly, once you get to know the language quirks, it's a decent language that is basically a DSL for text editing. The power you get from being able to lookup how something was implemented by the text editor developers easily is extremely powerful.
If you like vim's idea of modal editing, emacs is 100% all about that. languages are major modes, minor modes are functions and keybindings that can be enabled and grouped together at will. transient buffers are used to send output to and are treated as normal buffers that you can do things to. The architecture and extensiblity of emacs is pretty amazing actually. Every key press is just a function and every key can be rebound based on current context using things like mode maps that get layered on top of everything and have precedence based on where you inserted the binding with sensible fallbacks when required.
Disclaimer: I love vim as a concept but hate viml and the plugins that were hampered by the lame programming language that was designed by bram.
if you have not tried magit and org mode you just don't really understand the power of emacs and the power of having everything be a function. spacemacs just makes setting up that powerful environment fairly painless but it's still a very old architecture with some warts.
