For many years, way back in the dawn of time, I used a Pentax K-1000. It was a fully manual 35mm camera that was touted as the most basic 35mm camera available, and the only one that could be operated without a battery. It was truly simple to operate, but being completely manual, I missed many great wildlife photos because I was fumbling with shutter speed and aperture size (F-stop). I used that camera until it fell apart.
Then a wonder camera came onto the market, the Canon AE-1 program. That meant that one could let the camera decide shutter speed and aperture size. When I got mine I thought it was the final word in camera technology. Nothing could be superior to that. I used that camera for even longer than the Pentax, and I still have it. It still works although I never use it.
Anyway that camera set my habit of using program mode for every circumstance. In the last blog post I talked about trying to photograph strong evening light striking trees in a dark forest. I had to set the camera on manual exposure in order to replicate the mood of the evening.