I'm going Clojure route and in it for the long run. Being able to eval any single piece of your code in a REPL direct from your IDE in the context of your app is just insane. Also having one single language for JavaScript and JVM is super useful.

Also after programming for 4 years a bit I've felt the core of programming beyond CRUD/consuming APIs is about manipulating data structures. Having powerful utilities for this and not having to shove everything into classes and objects makes it really easy to get stuff done. Going back to Ruby feels like I'm working with a kludge in comparison. Everything that doesn't need to be a class is one, then you get caught up in naming things. Then you try to debug things to end up with an object that has 500 methods on it and you don't know where half of them came from because they were metaprogrammed in through 10 layers of indirection. Yesterday I tried upgrading to Rails 5 and gave up because I couldn't debug an outdated library in 6 hours without realizing I have to figure out what this library and ActiveSupport/Model is doing in order to make headway. Ain't nobody got time for that.