I have only seen a psychiatrist once in my life and it was to receive a prescription to help with some struggles I was having while in grad school. What about you? 
I have seen one, a long long time ago when my husband and I were having trouble.  
Yes, they can be very helpful in times of struggle. I actually studied psychology in school, but never went so far as to want to become a psychiatrist.
I took psych 101 and would have loved to go further with it, but there just wasn't time with my program I was in.  I find psychology to be very interesting.
Yes, it can be a very helpful science for understanding how people think and work and function in their life.