Babying the engine is a false economy. I recently watched a top overhaul on an O-470 at 1000 hours due to glazed bores. The fact that the owner insisted that the plane was warmed on the ground until the oil was "in the green" then insisted on reducing power as soon as the flaps were retracted was considered a contributing cause.
My gauge of when to take off has always been CHT. Once the first cylinder hits 300 I am away regardless of oil temp. In my POH (for an O-360) it clearly states that full power can be applied as soon as the throttle can be advanced without hesitation or rough running.
I recommend a Jabba (APS) course to any piston aircraft owner.