No, I don't agree that using a handsfree device makes driving and talking that much safer. When you're in the car talking with a person sitting in the car with you, chances are you're discussing something that does not require an aweful lot of concentration...basic chit chat to pass the time as you ride along. When you are on the phone talking, chances are it's going to be someone calling with a problem and you're going to have to focus on the conversation to give them an informed decision. Talking with people in the car is distracting too, even though they are not likely to ban people riding with you for a while
One example is my old roommate. When she drove and was watching the road, she was an excellent driver that I'd ride with any time. I followed her one day in my car while she was engaged in a conversation and to be honest, I'd have rather been following a drunk person. When she hit a raised manhole cover (road construction) and bent her rim, it proved my point. If you're not distracted, how can you miss something that large directly in the road in front of you when you're driving at 40 MPH?
The poster just above is much like me, I only answer quick calls while I'm driving, and most people really don't like to talk to me on the phone while I'm driving because they have to repeat so much of the conversation multiple times because I'm paying more attn to the road than them. It's not that I'm a bad driver at all, but the opposite, I'm an excellent driver, because i keep my focus on the road and not distractions.
One more thing to think about...when was the last time you heard of a motorcycle wrecking because they were distracted? They cannot talk on the phone, eat food, mess with the radio (OK, many touring bikes can do this), talk with passengers, look at directions, do make-up or any of the other distracting things that people in vehicles do. Aside from speed demons and show offs, I'd rather ride with bikers any day of the week because there's not much to do besides pay attention to the road (like all drivers should.)