I once wondered whether the appearance of the cameras was not dictated by the way it is controlled (as for "serious cameras").
Cameras started getting bigger and bigger when they started being really automated, with some exceptions such as the last small film SLR Minolta.
It is also the case for many other items such as cars : it has to be reassuring as well as aggressive. It doesn't have to be cute or nice looking anymore : a Nikon FM, a Peugeot 405 are small and look rather beautiful, though their later counterpart grew bigger and bigger : look at the size of a 407 (for our American friends, take the old Fiesta and the new Fiesta : the 1980s car weighs 750kg!) or of a Nikon D300! Is safety and the space taken by technologies the only things that we can account for? A 1970s Citroen GS is an extremely small car, the "safety cell" of which can survive (as well as it occupants) a 70kph crash!
In a way, there was a transformation of objects from operated tool (you operate a Leica) to useable objects (you use a DSLR).
We might be what ethnologists call "mutants" : we are half way between a world in which you have to instruct the object what you want to do, and another in which we use a function.
In France we have a problem with computers which is, I think, linkable :
Computers are mainly "anglo-saxon", that means we learn how to use a computer (and they're are designed for that) by wandering into the menus and stuff, and see how it works : the knowledge come from the experience. This button activates that function.
On the other hand, in France, we tend to start from a general principle and try to apply it to our action : perhaps the idea of the "decisive moment" used by Cartier-Bresson is a good exemple. And it prevents people from older generations from using computers properly because the logic is so foreign to them.
My generation, in this respect, is a "mutating" culture as we can master both.
Cameras might have evolved in the same way :
A Leica has got a number of parameters you have to set so that you can get the photo you want. You know you have to set the exposure and focus in such a way to get the picture you want, and you learn how to master it, from the "general ideology" you know.
On the contrary, modern cameras, which obey to the "computer logic" tend to be the application of a function to a process : on a film camera, the shutter opens and the light is painted unto film, though on a digital camera, the signal the sensor gets has to be processed by a computer to give you an image.
So, yes we are losing touch with our cameras, if talking about the old logic, only because we can't actually touch the process...