I think it's always worth it to learn new paradigms. They expand your view of what's possible, and give you a richer understanding of the other languages you already know, understanding some of the tradeoffs they made, and give you other conceptual and practical tools in your toolbox.
It's much like visiting other, radically different countries than the ones you've been brought up in. Even if you don't wind up moving there permanently, you'll be richer for the experience.
It certainly takes a lot more typing to get things done.