Taking "spiritual" in its non-theistic sense (wonder, awe, the Mysterium Tremendum) sure we do. Don't theists? We aren't emotionless robots you know. We just don't invoke a massive unknown, evidence-less entity to explain the cosmos. But, I would guess that our times of "spiritual vacuum" are much less intense and threatening to our well being as a theists are. Simply because what we base our philosophy on is observable, testable, rational, and "real". If something comes along to challenge or change that (like a profound new physical or biological result) we usually are excited and want to learn more. You can see how this makes an atheists world view much more robust that a theists, at least in theory.