I like to use Pomodoro timer as well, but I don't always use it as a break timer. Sometime's it's simply a replacement for my biological clocks saying "drink water" or "go pee please!" since I tend to ignore things like that (like Lindsey said).
On days where I don't use the Pomodoro timer I still follow a Pomodoro style where I work awhile, stop and context switch for a few minutes, then get back to it. I'm pretty sure I'm far more productive on Pomodoro days though.
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