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@Gary: Great series! It almost seems familiar but not too familiar, where are you here??
On my DSLrs I shoot aperture priority with ISO set to my choosing. Occasionally I would switch to manual mode. I prefer to shoot at the lowest ISOs available when feasable. The one exception is my 5D MKII which I shoot at ISO 160 which supposedly has lower noise. Using the monochrom I find going fully manual is easier for me. Though I typically shoot scenics and historical type buildings speed is not an issue.
It's funny, the way I use my DSLR's is completely different to how I've described in this discussion, closer to what you do. With them, I am mostly in M mode or A mode but always with AEL Spot Lock enabled (so complete control and flexibility). I'd absolutely never use autoISO with those. Mostly because the difference between ISO 200 and even ISO 400-800 can be quite big, especially when it comes to colour. So I require that control (for weddings). It's also a lot more controlled, so I might be in a space for a long time or doing a sequence of images which should all have equal exposure values for consistency (and makes editing easier of course).
Whereas with a "smaller camera", eg the Leica, it's really only personal stuff. So absolute consistency isn't important. Nor is colour, as I'm 90-95% B&W for that. But ease of use is important, so just having the camera work at the settings I want it to is above all the other stuff... and really, as mentioned, I have a huge amount of control even if still using AutoISO. It's all intuitive too, no menu diving or fiddly controls.
Interesting to know how you all use them though, I don't think any of us are all that far apart, we just use them for different things and enjoy different ways of working