Most people don't bench properly. They do it with elbows flared. Doing it that way does seem to emphasize the pecs more, but if your arms go past parellel with the floor, it does put stress on your shoulders. This is how I learned to bench back when I was learning from muscle mags and to compensate for my shoulders, I would only bench to were my arms came to parallel (about 4-6 inches above chest). This is fine for bodybuilding aspects of lifting, but we don't talk about that here.
That being said, if you bench properly, then your shoulders will be fine. I think Dave Tate has some good bench videos on youtube. As long as you tuck your elbows, it takes the pressure off of your shoulders.