Why do I say "dated"? Because the America of which Richard Hofstadter writes no longer exists. Published in the early 1960s (and probably written during the waning of the 1950s), Hofstadter's book stands in the shadow of McCarthyism, the anticommunist consensus of the Cold War, the bland gray-flannel-suit conformity of the Eisenhower years--all of which would begin to dissolve into irreconcilable fragments only a short time after the book hit the stores in 1964.
I would submit that anti-intellectualism is indeed still a dominant force in American life--politicians make appeals to the "folks", right-wing radio talk-shows belabor the follies of academia, films and popular publishing pander to the desire for the basest kind of sensationalism--but that it is an entirely different sort of anti-intellectualism than the kind that held sway over American politics and culture in the late 1940s and throughout the 1950s.
Hofstadter's book is certainly worth reading, though, especially if you are interested in the culture of the 1950s. Like Mills' _The Power Elite_ and Reisman's _The Lonely Crowd_, it remains one of the great sociological/historical works from that era; one that offers a vivid portrait of a unique period in American history.