Not all "intellectuals" are created equal. Consider, for example, Umberto Eco. If you like that sort of thing (and I do) his Travels in Hyperreality is a delight; but here we are dealing with a genuinely original thinker, a witty writer, and a man who delights in popular culture as well as "high culture". A single essay in that book is worth more than everything Sontag ever wrote. She and Barthes are so painfully aware of themselves as "intellectuals" that they disappear up their own bums. If you like French intellectuals, dear old Sartre was much more fun than Barthes, though I can't say the same for Simone de Beauvoir.
Perhaps I should make my attitude clearer. I am all in favour of art theory. It can be fascinating. But it needs to be well thought out and well written. Even when it's chewy and hard work in places, such as Gombrich's Art and Illusion, it can still be well worth reading. But I have rarely read anything specifically on photography that was one tenth as good Eco or Gombrich -- or as good as Richard Gregory's Eye and Brain.
Kozloff's Photography and Fascination is certainly among the best, but then, he deals with real photographs, real situations, not the vapid and etiolated generalizations of a Barthes or Sontag. This is in marked contrast to most books on the "philosophy of photography", which remind me of Dorothy Parker's "This is not a book to be cast aside lightly. It should be hurled with great force."
In other words, do not imagine that my disdain for the maunderings of third-rate pseudo-intellectuals is a symptom of anti-intellectualism. Take it, rather, as an admiration for true intellectualism. It is disdain born of decades of readings on the subject, as opposed to the reverence extended to Sontag and the like by mostly young students who have read very little else on the subject and take Sontag at her own valuation, or at the valuation of those of their tutors who recommended her.
Finally, I am utterly convinced that the vast majority of whatever I have learned about photography has come from going to hundreds, probably thousands, of exhibitions, and from looking more or less critically at pictures (not just photographs), whether at exhibitions, in books and magazines, on billboards, or even on packaging. As I say above, art theory can be fascinating; but just as camera collecting and taking pictures are only tangentially related, so are art theory and art. Arguably the best book on art theory is Bayles and Orland's Art and Fear, which basically says, "Artists all get scared but the only way through the fear is to go on making art." It is not prescriptive about what that art is, or how to make it, or how anyone else makes/made it; but it is admirably descriptive.
Cheers,
R.