I gotta agree with bmattock. It's all how YOU perceive what you're doing. There's no inherent "coldness" in an SLR. Tons of photographers have captured "involving" imagery with SLRs.
I also don't understand this comment:
"If I get it wrong with my DSLR (which I reserve for tele and macro) then nine times out of ten it is because there is some setting somewhere that I have got wrong, and like the dumb machine it is, it has acted upon it. When using my IID if I make a mistake I have made it directly. I only have four controls to work, after all."
Either way, it's YOU who have gotten it 'wrong.' How is the IID not a "dumb machine?"
I have a 5D, and it, similarly, only has "four controls to work." If someone were to tell me it has more, i'd suggest those other controls were built for the next owner. No matter how complex a camera may look, there are always going to be simple ways to use it. On the 5D, i set ISO (have to do the same thing on my Ikon/M7). I set aperture (same thing...). I set shutter speed (same thing...). I focus (same thing...). Simple pimple.
The idea that a rangefinder somehow captures life more honestly is rather ridiculous. There is the potential for a truth if the user adopts a different identity when using various cameras. I can easily believe that RF users are channeling HC-B when shooting with their Leicas. They approach subjects differently, stalk them, wait for "decisive moments," etc. SLR guys are probably less likely to idolize dead guys and "obsolete" equipment. But, then, you can't count that as a 'rule,' because there are some of us who shoot with both, and who also have a HEALTHY : ) respect for our predecessors....
So, back to the original question. I like rangefinders because:
1. They're smaller, for the most part, than the SLRs i would want to own, when lens is included.
2. There is a great deal of variability in the lens range. A wide choice. I own Canon and Contax SLRs, and have owned Nikon, as well. For each system, i realistically have a choice of one or two 50mm lenses. One or two 35mm lenses. With the M-mount, i could choose between ten. And, if you're as particular as i am about 'lens character,' CHOICE is an addictive element.
3. I'm supposed to be able to handhold an RF at slower shutter speeds than an SLR. But, i'm beginning to doubt that. I haven't done any stringent tests, and my 'loose' tests haven't presented any truths.... But, i don't feel as steady with an M7/Ikon as i do with a Canon or Contax SLR. And, last night, comparing a Rolleiflex with a Hasselblad, the Hassy felt much more steady. But, that idea is still in my head....
4. RFs don't look like expensive, professional cameras. They look 'old.' Like antiques. When shooting in certain enviroments where it isn't safe, that's an advantage - to look like i'm using something not worth stealing.
5. I just enjoy variety. I like being able to choose an SLR for one purpose and then an RF, just to see things differently, and to feel like i'm doing something different. It isn't an inherent advantage of the camera - it's just that it's 'something else.'
6. RFs look and feel cool. If they didn't, i probably wouldn't use one, despite the above. I have a camera fetish. What can i do?