And the field of psychology itself is rapidly evolving. New methods, new ways of doing things, and new research questions are always coming up. Life does not get boring if you have an opportunity to always be learning. One of the best things about the field of psychology is that it's so broad. It applies to just about every facet of our lives.
Students often take one psych course and find that they really enjoy it.
Then they want to take another one and another. Right now I am the director of undergraduate studies for the Department of Psychology at the University of Virginia. Some, for example, are pre-med majors who at first want to study only the neuromechanisms of behavior. Once they start taking the other psych courses, however, many become fascinated with how everything ties together. I earned my undergraduate degree in psychology on an ROTC scholarship at Trinity University.