Begin the takeoff roll with the control wheel approximately centered. Throughout
the takeoff roll, gradually increase control wheel displacement into the wind only
enough to maintain approximately wings level.
Excessive control wheel displacement during rotation and liftoff increases
spoiler deployment. As spoiler deployment increases, drag increases and
lift is reduced which results in reduced tail clearance, a longer takeoff roll,
and slower aircraft acceleration.
This is from a 737 FCTM. Two things stand out to me. 1/Many pilots I fly with don't start the roll with the control wheel approximately centered and increase it as it is required. And 2/ What is "excessive" control wheel displacement?