I really enjoy Common Lisp being imperative enough to make iteration and collection orthogonal. You can freely mix-and-match functions for traversing data structures (dohash, maphash, etc) and ways to accumulate values (setf, push, ext:collect, etc.) I find that equivalent purely functional code often needs more functions to both traverse and collect at the same time e.g. fold, map, flatmap, etc.

I know that the functional universe has solutions to these problems, like the State monad and reusable collections protocols based on common minimal primitives, but I really appreciate being able to just freely string together tokens like DOLIST WHEN EXT:COLLECT without any elaborate frameworks.

So I suppose that programming in Common Lisp makes me appreciate non-functional programming.

Having said that, I do feel like a caveman every time I spend brain cycles on picking between EQ/EQL/EQUAL/EQUALP/STRING= or worrying about whether the object I'm updating might come from a quoted constant and invite undefined behaviour. Hard to have it all...