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I think that you are missing the point of Cross Drilled and Fire Slotted (also called Gas Slotted) rotors. The purpose of cutting the holes and slots are to INCREASE the contact between the pad and the rotor. When you brake, gas is released from the brake pads when they heat up. This gas creates that is released keeps the pad from contacting the surface of the rotor and it appears that your brakes are "fading" when they are actually "gliding" on the gases. The cross drilling and slotting remove the gases from between the pads and rotors to provide a better direct contact between the rotor and the pad.
It is very similar to an ice skate. The friction (heat) from the blade over the ice causes the ice under the blade to melt. Skaters are actually gliding on a thin sheet of water, similar to the gas in the braking scenario.
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I am not missing anything + your not increasing anything, you still lose contact surface area and if you know how to brake then you do not need cross drilled rotors especially for the street.
To each his own.
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