What I've noticed often with coworkers, and even myself at times, is that management often won't do anything to discourage your workaholic tendencies - but it was never actually an expectation in the first place - just a belief in the employee's head that it's what's required of them.

When I've been through such phases, once I realized that I could set reasonable expectations, it was never actually a big deal. Eventually I even started taking my vacation days, nervous that my job wouldn't be waiting for me when I got back, but that was really all in my head.