747FOCAL-
As 411A has said, many carriers employ the option of the "overspeed" t/o. Many more have the option (in case of a microburst/windshear threat) of delaying the rotation for as much as 20 kts if the runway will allow it.
HIPPO-
I think you'll find the opposite to be true. Delaying your rotation will put you faster and higher, not the other way around. V2 is well below your best angle of climb and best rate of climb.