Yeah, I work in a field where long hours are celebrated -- workaholism is a way of life, and drinking is part of the culture.
For years I convinced myself that alcohol was needed in order to "decompress."
Once I started going months w/o alcohol and experimenting with sobriety, I realized what a folly that was.
I became far better at my job, more focused, up before everyone else -- and got promoted multiple times. I was doing intensive workouts while other people were still sleeping off their "happy hour" drinking from the night before.
Actually, I don't even know how I used to do it before. I was always nursing some degree of hangover and pining for "relief."
Bottom line, whether you're a workaholic in startup culture, a 9-5 employee on a factory floor -- or working two jobs to make ends meet -- you will do far, far better at whatever you're doing sober.