Some writers use more words to tell more story. For example, Ken Follett's Pillars of the Earth didn't seem verbose to me.
Dale
That's one HUGE novel.

And you bring up a good distinction: an accomplished writer can make a lot of words work for him/her. Less skilled wordsmiths seem to use a lot of words because they can (hey, words are free and all)--or because they feel like they should.
I've never seen any statistics, but my general feeling is that right now we are at the end of a low point--that is, novels are about as short as they are going to get, and they are currently trending longer.
Some of the word counts people describe as long aren't really that long. The average length of Dickens is said to be something over 350,000 words. I'm not saying that's short or anything, but I wouldn't call it "shelf-busting," or "supersize," or "ridiculously inflated." There are far worse offenders out there.
Maybe that's part of it. There's been an expectation, a desire and a hunger for conciseness. Good point re: hitting the low. What goes down has to go up eventually, yes? I'm not sure if the publishing world created the hunger or if it merely served it, but either way, hmm.
Re: Dickens. When he was writing, stories were also told differently. There was a smaller market and there wasn't pressure for "shelf space" or "positioning." I can't imagine any debut author today would be encouraged to write 350,000 words. Yet, some seem to try. I'm thinking of one debut novel that clocked in at 130,000 words when the story did not warrant it. It was probably edited down to somewhere in the neighborhood of 100,000, and that was still too long.
I think a lot of long stories have a lot of fluff in there that readers skip over, I know I do. I like my novels at about 275 pages. I know I've read interviews with editors who stated they like a book at about 300 pages, that publishers think they need 300 pages to make it worth while to publish, but go to a bookstore and look at the novels that are coming in at 200 pages and less.
Elmore Leonard's latest book, "Road Dogs," is 262 pages. Leonard has stated he leaves out what readers skip over. On the other hand, read one of the John Updike novels. He turns out books well over 300 pages, but when you weed through all the layers of descriptive material, he's only got about 100 pages of story. On my reading table now is a book of 945 pages and contains 5 complete Dashiell Hammett novels. Now that's the kind of big book I like.
300 pages=a novel? Interesting. I wonder if that number represents some sort of "critical mass"--looks good on the shelf, consumers feel like they're getting their money's worth, etc.
Leonard is a man after my own heart.

And 5 novels in 945 pages? *swoons*