In support of Peter for saying the things I wanted to say...If I knew the questions to ask, I could find the answer. I love learning about theory, but since I did not major in music, I was not allowed to take a music theory course even as an elective! And I agree with Matt, I prefer to see chord symbols above the lyrics; it's much cleaner. As far as names of chords, that's just in order to communicate with other people. I can read the piano notation or score in order to know which notes to play in order to sound good.
PS Just last month I FINALLY got my hands on a music theory textbook given to me by the grad student who taught music theory at a nearby college. It is very poorly written and a big disappointment, much like the college electronics lab course I taught and found that the "official" textbook was atrocious.