I love a good long browse too but browse less these days because of the temptation to actually buy books and read them at home. Re the Guardian article, I've been to 3 of those stores: Strand (I'll go back when I'm in NY next month), Shakespeare & Co. (a purportedly American literary bookstore that [shock!] didn't have WC Williams' Collected Poems) (it has been said that there's a superior English-language bookstore elsewhere in Paris), and City Lights, a disappointment, a tourist trap. As compensation, not far away, there's a very good second-hand bookstore in mid-Berkeley, don't recall the name.
New Yorkers - are any bookstores that specialize in poetry trucked away somewhere in some of the boroughs? How about second-hand bookstores that have a lot of good old noir / hard-boiled / golden-age sf paperbacks?
I wonder if the Berkeley book store was Moe's or Pegasus. To be honest, I usually only go into Half Price Books, which is right near the campus, but I can browse for a long time when in the mood.
It looks like Mercer St. Books is still there in Greenwich Village (206 Mercer), but I haven't been in there in ages, so I don't know if it still holds up. It used to be my 2nd favorite bookstore in New York after the Strand.
I've never been to Mercer St. Books, but their Facebook page is fairly current, so it seems they're still in business. Looks like a very good and interesting (in the best sense of that word) bookstore.