No, on a street car it doesn't. You'll never hit a speed or being a situation that you'll actually need it. On the track it can be a different story dependent on how good you actually are.
If you want lightweight Rota's get DPT's...17x9 with an 18-19lb weight...LOTS of wheel there.
Forged does make a wheel stronger which is why they can get away with using less metal...hence the drop in weight.