I know pros who used auto exposure, well once auto exposure got really good with the EOS 1 and F 5, in the day when I was still in college and wanted to be a pro I shot with a Konica T and shot shutter speed priority, later in the Air Forced I to Nikon F, and had traded in my Konica gear for a F with motor drive, all manual, but there were times I missed auto exposure, like days with quick moving clouds. I have never cared for aperture priority I always want to control the shutter speed. When I shot with a F3 it was always in manual, after my F3 was ripped off I bought a Sigma SA7 and latter a 9 which I shot for years, and used shutter speed priority and P mode for flash.