I'm in the "Just shoot on 'program'" camp... sort of...
You don't have to shoot in any one mode all the time. I don't.
I like shooting on aperture priority mode most of the time but sometimes I shoot on program mode. Still, other times, I shoot on fully manual mode. I can't tell you exactly how I decide but there is some technical thought that goes into it. There is also a lot of thought about the situation I'm in. For sports or fast action, program mode is what I'll usually use. For portraits, still lifes or creative shots I'll use full manual. For general "shooting around" I'll use aperture priority.
You guys know how all that works. You're all better at it than I am. But my point is that I'll often jump around from mode to mode, using manual for one shot and auto or semi-auto the next.
So, if you want to be technical and manipulate the camera, add this parameter into your decision tree: "When should I shoot on manual and when should I shoot on automatic or semi-automatic?"
Just go out and shoot a couple-few rolls of film on program mode, bring them home and develop them then sit down and compare them to other pictures you have already shot. See where the differences lie then put that information into your mental database and try to use it to decide what mode to use in the future.