The JS everywhere is so much like the "only tool you have is a hammer, so every problem looks like a nail" thing, it's amazing.
Creating a simple, secure, extensible middle-tier is a solved problem and is not in need of JS trying to solve it in a much more obtuse way. I've created many myself in everything from Delphi, PHP, C#, Groovy, to Java and I would never pick JS for that layer.
And a final thought, PHP used to get tons of bad press for being messy, etc, etc. But this JS stuff takes that mess to a whole new level. Perhaps PHP devs moved to node/js so they could make a mess and everyone would still think they are the cool kids?