With a few exceptions (like APL), I've always found it pretty easy to read code in most languages, as long as I understood the paradigm, and the original author

With a few exceptions (like APL), I've always found it pretty easy to read code in most languages, as long as I understood the paradigm, and the original author made at least a tiny effort to use sensible naming. Imperative languages only have a handful of concepts, like variables, type declaration, looping, branching, function call, etc. and the language and the context generally make those pretty easy to identify. The other language types (functional, forth-like, etc.) have similar (but often different) concepts, and once you understand the concept and can see it through the syntax, it's pretty easy to follow along. Writing new code in a new language is the difficult part.