I once created an engineer performance grading system to help management understand when an engineer was ready to be promoted from junior, full, senior, and through to principal. There were seven criteria, one of which was “Grace Under Pressure”. As you become more experienced, your ability to deal with the pressure of tight deadlines, fluctuating requirements, and idiot co-workers should increase as you find creative ways to cope with the stress. Dealing with stress becomes the hallmark of someone with a lot of experience. One of the best ways to deal with stress, I think, is humor.