Roller Cammed 318/360

Since I own a vehicle with a 5.0HO I know that one of the aspects of that engine that make it a good street performer bone stock is the fact that it is roller cammed. I have heard that roller cams allow for more aggressive cams with a better idle and overall more efficiency than the other cam designs. With that said I don't hear about too many roller cammed engines on this board. I have read about alot of hot setups but none really focused on the roller cammed aspect. Is this correct? Or am I missing something, which could be a possibility considering I am a rookie.