Don't make the mistake of never seeing your professors outside of class. Office hours are there to be used. I often find that there is a misconception about office hours. Some students feel that they are only to be used if they have a personal problem and need to talk to the professor. That's not at all true.
Office hours are there for tutorials .
If you are having trouble with homework, completely lost about a question on the last test, or have a question that didn't get answered during lecture, go to office hours. The best thing about teaching is the students . I've really found this relationship to be enormously engaging and productive. The Environmental Studies Center really encourages faculty and student interaction. If you establish personal contact with the professor, it makes the classroom less intimidating and a more comfortable space to speak up.