It really depends upon the subject and the time constraints of the shot if I have time to compose or if I really want to tweak the exposure: M if I am just shooting normally: AV if I need to prattle off a bunch of shots quickly and they are all different: P
I use M probably 60-70%, AV 30% and P maybe 10% of the time
oh yeah, I've never had a camera with auto ISO so I have no idea how often I would use it...it would probably replace all my P mode and some of my AV mode.
Canon XTi, AE-1 Program, Rebel II, Tamron 17-50 VC, Zenitar-M 50/1.7 and a bunch of other cheap lenses (50/1.8FD, 18-55 EF-S Kit, 35-70 Kit, 80-200 4.5-5.6). S100 classic.
ISO always as low as the camera goes, Av when I need depth of field, but limited to f/8, and Tv for action, set for the amount of motion I want to be visible in the shot, and M when I use TS lenses or shoot the moon or backlit objects
Started out as a beginner using Program mode. Last year got a 7D and graduated to Av mode. Recently have tried M mode a bit. Still like Av the best and usually set ISO at 100-400 depending upon the focal length and available light to get enough shutter speed.
EOS 5D miii, EOS 7D, 70-200mm f/2.8L IS ii, 100-400mmL IS
M, always M. I light a lot of my pictures too, which means M. I did shoot some portraits for a feature the other day on Tv, but I'm so used to M that the results are usually worse when using the automatic modes.
I bought my first DSLR in March 2012 (Canon 7d). I'm still getting the hang of it. I spend 99% of my time in Av, but on the rare occasions when I shoot in low light indoors, I find that I have to switch to manual (and my 50 1.4). Seeing everyone of the forum who shoot M so much, I'm motivated to spend one day shooting only M mode. Here's an example of the shooting conditions I'm usually in:
Metropolis, IL Superman Celebration 2012
I'm still a noob, so I'll keep practicing and reading the forum
Canon 6D, Meike battery grip, Black Rapid Strap EF 40mm f/2.8, EF 50mm f/1.4, EF 24-105mm f/4L, EF 70-200mm f/4L USM, EF 135mm f/2L USM, 430EX II Speedlite HDR photos look best when I can't see them.