OP - I'd like to clear this up. I am not trying to be the arbiter of others taste, nor am I saying that making huge prints is "wrong" or "bad" or "shouldn't be done." That's not my point at all. I am asking the question, "what photographic property or principle is enhanced by huge size that can't be understood in small size?" (And again, I am not concerned or interested in the angles regarding decor. (Yes, I do understand the interior design people like to fill big walls with big pictures.)
I don't believe there is any enhancement in photographic principles at all. I think the single reason for ultra large prints is: They can be sold for more money that small prints. The exact same reason as this....
Large prints are sold for more due to production costs involved, from initial gear to capture , perfect Large Prints, Mounting , Framing, and probably the most underrated cost is shipping of work. - In my town Ed Burtynsky is at the head
of the heap, he uses very good large format capture devices, he has built a lab to personally print his work to his vision, as well he mounts and Frames his work. We are seeing his work being shipped worldwide for exhibit. Many local photographers are influenced by him and try to make the large print , but always seem to compromise in the production stages and the work is then considered (Stretched beyond what it should).
This is where I agree with those who knock big prints... but done properly I love big prints.
I work with some photographers where we are making life size images of tree planters, in this project the photographer exceeds all expectations in the production stages and the super sized, life size images of these tree planters at close distance make you think you are in the scene.
This is where huge size works for this particular body of work, when we make smaller test print the effect is not the same and not what the photographer wants to convey with her work.
The tipping point is the new digital devices that are capturing monster detail, I believe we are going to see much more large work, where it may common to see life size objects in some of the larger gallery's at full image resolution.
I am one of those people who can walk in a large gallery and appreciate a beautifully crafted Large Print and not wish it was smaller.
The first time I saw Salgado's main show at the GEH, there were two sizes of prints in the show.. 16 x 22 inches and 24 x26 inch prints. IMHO the larger prints were much better than the smaller prints, in fact I think two printers were commissioned and the printer who made the big prints was much better.
Someone mentioned Gursky and Jeff Wall as influencers, I think there are many top photographers showing the younger students and now the technical cameras are able to be put more in photographers hands. I know of groups of artist that save their money and put aside time and together rent out these digital cameras and do short bursts of work . Every two or three months they are able to concentrate on their projects and make hay while the sun is shining .
Don't get me wrong , I too adore small prints, in fact Paul Paletti has what I consider two of the best photographs I have ever seen, one by Brett Weston (small) and one by Gerry Winograd (five people on park bench) again small. I find it amusing that there are such strong opinions on this subject..
Put me in the camp of liking both small and large images..