Ah but...
"I'd argue about the superiority of rangefinder cameras, too - I want to see what I'm photographing through the lens that's taking the picture, thank you - but I suppose that's horses for courses."
Well I want to see what I'm photographing too, and what I'm photographing should be what's in front of me when I press the button.
I don't even want a switchable lens -- my rangefinder has a fixed (moderately) wide-angle lens with a shutter in the iris. The short distance of travel for the shutter curtain gives me practically instant snaps. Much better for (eg) getting a picture of a dancer in which you can see his/her face mid-spin.