If you don't learn to think in a language like Erlang, you'll never be able to fully bring those idioms and paradigms back to your day job language. I'm simply repeating the advice of the Pragmatic Programmers from nearly a decade ago, but learn a new language every year.
And as any weightlifter will tell you, if you're not sore when you're done, you weren't working out. You were coasting. No pain, no gain applies to your brain as well as your back. So if you pick a new technology too close to what you already know, it might feel too easy. If so, back up and adjust your technical workout plan. Hit the muscles you haven't used in a while.
Feel the burn! ;)
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