I would say I'm in M-mode 90% of time (never when raining or damp).
My setting on a 6mt are mainly for MDM and steering feel. I keep the "power" button off.
I tried power on Vs off and while it's definitely more peppy with the snappier throttle I don't feel it's very linear with surges occurring unintentionally sometimes. Plus, with the power to normal you really have to put the pedal down to get max acceleration - since I typically am under 50% throttle it makes it feel like there is some extra when you really are on it!