My mind is perpetually blown by H0llyw00d. I'm really starting to understand this one teacher's mantra of technician vs designer. Maybe it will change over time but here is where I stand at the moment based on my personal experiences. He always says 'don't be a technician; be a designer' and has noted that many of his trained students do eventually become designers, not illustrators.
I've been in quite a mix of classes/experiences (productions/post, etc) and whatnot and have noticed that the l!ghting guys will b!tch about 'why doesn't production give me another guy?', the drivers complain 'why are they always rushing our lunch breaks?', the concept guys talk about 'your perspective is off' or 'this doesn't look like metal' or 'compositionally does this work' and the matte painters talk about 'what's the new matte painting software we have to learn so this works/ looks real for four seconds on the screen?' and other assistants (c@mera, P@s, etc) on set will often brag about 'which job they just worked' (the importance is on the job/movie title, not the actual work they did). I don't know about some other departments in detail so I won't comment about those.
I was actually convinced for a while that concept people did do the actual design (but always a bit confused by that), but I'm starting to rethink that. In fact, I've been learning that they are requested if need be, but not necessary to provide a design aesthetic for a movie; that's between the Pr0duction designer and the Art Direct0r (which is what I learned in f!lm school anyways!). It's very telling actually that a LOT of student c0ncept work contains NO visual style or historical/cultural focus or knowledge in terms of the design elements (you would think if they were really designing 'everything' that would be super, duper important, right?) A lot of students don't even think about class structure! Also, it's very telling that they're actually (in film) under the category "Illustrat0rs", and that there is no Ac@demy award for C0ncept Des!gn.
I've sat in the company of every single one of these departments. Now sitting in a class full of art directors/producti0n designers, they actually talk about freaking DESIGN. Give them a period in time, and they can tell you what the architecture was like, the culture, the class system, in an intelligent and practical way. They may not always be the best draughtsmen (there are some who ARE though, and therefore their need for a c0ncept or illustration guy to detail out their idea or continue the vein of their visual style for the entire movie is minimized), but they can read and design a real location in their head, complete with references to pertinent visual and architectural styles. And often, they have (within their portfolios) a c0nceptual element that shows that they can draw what they see in their heads.
I have in my idea that it's like a guy is building a giant mansion. There is the guy who will put up the money for it, the guy who actually designs it, and he hands off the detailing (given what the big picture should look like) to his other people to detail out the parts he can't do because he's busy doing other stuff (meetings with the money guy, the potential buyer of the mansion, etc). (This, incidentally, is where a small problem arises, because the people detailing out the parts start to believe that they designed the entire thing (which is partially true but not entirely; you were given a skeleton/ armature within which to construct something based on a coherent visual style that was pre-determined; you didn't just pull it out of a hat, and when it is pulled out of a hat, often, it's not usable by production to build physically, which presents a problem for EVERYONE)
Then from those designs, the guy building the mansion sends it to the construction chief guy, who imparts the design information to the guys actually building the mansion. The people who are actually building it are working harder than usual and want another guy, but the guy who is buying the materials sees that it's getting done on time even though his guys (actually building it) are complaining about wanting another guy. In actuality, he never spends money on that other guy, because it will cost him extra that he can spend on materials or something else that will directly benefit him and his profit on a larger scale. It's all relative.
I know that depending on where a person is in the scale of things they may be offended (I know I used to be when I was in one of the production department where we thought we 'ruled things' even though everyone else CLEARLY didn't think so) by this post but well, it helps to take a step back sometimes and think a bit differently.