Yeah, we use CCL for local development and SBCL for running code on servers. I hear that the development story is better with CCL due to improved error messages but I'm not sure how much I agree with that, however we continue the practice because it ensures that we're writing portable code and aren't tied to a single implementation.
The old joke about lisp ruining all other languages holds true (at least in my experience), so it's a monkeys paw wish of yes, you get to work with lisp but you'll never be able to enjoy another job again.
Although Lisp spoils you for other languages, but it also crystalizes and clarifies the other languages. As you enjoy the latter, the former will fade.
By clarifies what that means is that if something is being done badly in some language, your mind has a reference model for that being done well. That model can guide you around the distracting crap. It also gives you a vocabulary for talking about and thinking about it.
