To be honest, I'd guess pretty much all chronograph functions are unused for practical purposes by 99% of owners 99% of the time. Oh, and setting a chrono running just to see all the hands turning does not count as "practical". The bezels on most diver's watches fall into the same category. I would suggest the same about tachy/tele bezels (whether DON or not).
Useful but less common complications to me are practical ones like reasonably accurate alarms or something like the Gruen Airflight. Then again, those that know me do say I dance to the beat of a different drum..........
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