This is my city, and I just recently started using this method.It may be boring, and repetative but it's extremly effective. I don't have any avenues (except one, which I built it for a rare exception), all one way streets. Before I started densing my zones, I earned so much. I was earning around $10k per month, and that's a new record for me without cheating (even with cheating). I hardly even had to use roads then, mainly streets. And I figured that this method would perfectly set me up for easy one way streets too, and I didn't have to build any avenues. I have very little traffic probblems, and the only public transportation I have is passenger and freight trains.