I think this phenomenon is related to the magnification of the viewfinder, and also how well the VF fits the lens' angle of view. Most SLRs are at least 90% full coverage in the VF, but the relay lens can give either a "tunnel" effect or alternatively a wide apparent field of view. With rangefinders, you also have various apparent fields of view in the VF, with various magnifications depending on make and model, and the frame lines may also play a part in how a person ends up liking (or not) the view. In my case the Zorki IV has a tight viewfinder, a bit of a "tunnel", but my Olympus Pen D (although not a true RF, as it scale focuses) has a bright, wide VF. My Retina IIIC is a bit smaller of a VF than the Zorki, but the focus patch is about the same size, giving the impression that it's bigger.
The big difference I notice with a RF is that the frame lines obviously get smaller with a longer FL lens attached, so although the overall view in the VF doesn't change, the usable portion of the image gets progressively tighter.
One more observation: in SLRs, the lens' maximum aperture affects the brightness in the VF; I notice this especially when attaching a typical slow telephoto zoom, where even in daylight the TTL image appears noticeably dimmer than, say, with a fast prime. This seems to affect the way that I relate to the scene and my composition.
These discussions about SLR v. RF may seem pedantic to some, but they are important to the user; the viewfinder is the single most important interface that the user has between the subject and himself, and affects most acutely his response. It's a good thing that we still have choices.
~Joe