The question about how programed exposure modes work made me wonder. Are there situations where a program mode is good for some reason, not just as a convenience or because you don't understand exposure?
I've so far been scared of program modes because I don't know what the camera might pick. There are various tradeoffs, so there are various programs, so you have to think and select something anyway. Picking two of ISO, aperture, and shutter speed doesn't seem harder than guessing the right program mode to me. Also, selecting the program mode is usually a lot harder than changing the f-stop. For most things, I select ISO up front for the conditions, then change the aperture on the fly while watching the shutter speed the camera picks.
Am I being a control freak and there are cases where it would be good to let the camera decide, or are program modes for "dummies"? You professionals out there, do you ever use a program mode?