Yes. I have studied Psychology Major and I do at times use it, but not enough. Are you referring to pop psychology though? (That being popular theories that have sprung up amidst certain trends in society). Lately I am using it as I have just completed a counselling course and hypnotherapy.
I can and do for example recognize certain personality disorders, and abnormal psychology in some individuals that I meet or are close too. Sometimes I am too close and I can’t see what is going on.
A note to @SmartAZ I studied Psychology for 4 years and completed my majors. Along with that, I also studied the social sciences which includes Sociology, Criminology, Social Work, Social Law etc. A massive part of our degree contained Statistics which were measurable data collection methods. No science is perfect and all sciences evolve as time goes along. I feel l offended that you feel my 7 year degree was guess work.
Psychology in essence is the study of man in context (society) and this includes variables such as culture, age, developmental issues and disorders. It is classified as one of the most complex sciences.