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I know if you were to put 20W-50 oil in a car's engine that calls for 5W-20, you'd lose a significant amount of HP and acceleration would feel sluggish.
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Grampi, that's a good analogy but just a little too the extreme. The primary purposes for the thinner viscosity engine oils is fuel economy. With that being said, it can and will effect economy by using extra horses to move the thicker lubricant but I don't think you would feel it in the seat.
Ultimately were you see contact/wear is were you need lube(type depends on environment and application). AR bolt carriers can use some lube inside to keep carbon fouling down but gas piston systems need to be run dry.