They are tools used by programmers. They do, in fact, have languages of their own, but more to the point they have whole ecosystems of expected behaviors, idioms, best practices, etc etc etc. Those take longer to learn than a programming language.
Similarly, "web app" isn't a programming language, and neither is "server side". But they are toolkits that a developer must learn on top of their programming language, and it takes longer than the actual language itself.
