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Someone should post actual weight numbers from the wheels, fronts and rears, 18s and 19s, and finally with and without tires. I seriously doubt the claim that 19s are lighter than 18s. As others have stated both the weight of the wheel and it moment of inertia are factors that affect the performance of a car with the wheels. The wheels have be be linearly accelerated like any part of the car that does not rotate (say a seat) but in addition they have to be spun up (angularly accelerated) which takes additional power.
Although I saw an old test report for the E46 M3 that showed some performance advantages (at least two of the following acceleration, braking, track times were improved) for the 18s vs 19s, I seriously doubt you can feel the difference, they are quite small. It is like saying you can feel a suitcase in your trunk in a car that weighs 3700 lb with 400+ hp. Not possible.
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