That's me. I don't regard it as an advantage, but I've come to be okay with it. I've quit before, for months at a time, and once for 2+ years. I used to go to Japan regularly for 2-3 weeks at a time, during which I'd have none. What I found is that I'm not more productive without it, and the quality of my work was not affected by it.

I found that indeed I am able to concentrate more deeply with it. Without it, I find myself far more tempted to drink to relax -- which breaks my personal rule for alcohol use: never for stress relief, only for celebration.