The hands roll but they only do so WELL after making contact. If you are a right handed hitter, at contact your right hand palm should be facing the sky.
I think that telling people to just swing a golf club like they would swing a baseball bad is a VERY bad idea. A good baseball swing is about as rare as a good golf swing. Unless someone is relatively comfortable stepping into the batter's box against a collegiate-level pitcher, they probably don't have a good enough baseball swing to use as an example for their golf game. [Not to mention that without learning "twistaway" you would just get an extreme slice.]
I don't think it's easier to hit a baseball. Professional baseball players whiff a lot more than the worst amateur golf hackers. Baseball also gives A LOT more room for error. In baseball I don't have to hit every ball into centerfield with optimal trajectory. I can shank it, pull it, top it, and still hit .300.
Tim