I've worked with a lot of different cameras over the years but the one camera that always seems to have a special "feel" and "energy" to it when I pick it up is my Rollei TLR. Have no idea why but when I'm out with it things happen and I come back with usually my best stuff in ages. It's not just the format as I have a Blad as well, it's something else. Nothing that can be quantified, rationalized or anything like that, it just comes from within.
Do you have a special camera like that?