What I love about using meterless manual cameras is that they get me one step closer to thinking *before*.
I can't just raise the camera and take a shot. I have to think about what kind of shot or maybe what two or three types of shots i might want to take in a particular environment, try to guess where the subject might be (if not stationary) and determine the right exposure for the environment and potential subjects (DOF ammount, motion blur, etc). It take a a little time ahead of the shooting, but after that, I'm so focused on the scenario, or scenarios that I've anticipated, that I rarely fail to capture them.
Am I missing potential shots while I'm preparing? Yes, but then again, no. I choose to think like Winogrand, who claimed there were no pictures happening while he was reloading his camera.