Yes, I've tried it on a few girls and it works. I've also tried it on a few girls and it absolutely doesn't work.
Maybe I'm completely deluded here, but I find that different women enjoy different things. Some women will gush when you stroke their G-spots... I know other women who love to cum when you stroke the mons pubis and then work down onto the clitoris. My ex-wife enjoyed clitoral stimulation, but the G-spot did nothing for her.
Technique is useful, but sensitivity to what your partner likes is pretty damn important, too...
Have fun, CGP