2 cups per day. I find it sharpens my attention and problem solving, both in traffic (on a motorbike) and when programming. The longer I can spend away from it, the more effective it is when I take it up again.

Not essential part of work life.

Don't wish I drank it less.

Might consider alternatives, but I would need to be convinced that other stimulants would be sufficiently advantageous vs deleterious.