Feel of a bike has as much to do with the design of the frame as it does with the material. I know someone who had to get rid of their Ti frame because it was too harsh. I also know people who have cushy riding aluminum... My carbon bike certainly doesn't feel dead.
I have cheap-o second hand aluminum bars on my ti bike and I can't say I notice much road buzz. I did however replace the cheap-o second hand seat post aluminum that I put on it originally with a carbon one and that made a big difference (not to my hands... but to my backside at least).