The subject of popularity brings really brings the trolls out of the woodwork.
I too sincerely enjoyed Spirited Away. It is not my favorite Miyazaki film; that goes to Castle in the Sky (with Castle of Cagliostro just behind that). Spirited Away throws the viewer so deep into a world rich of Japanese culture, lore, and symbology that presents itself as pure fantasy even to the Japanese. Much of this films audience is captivated by the world, much more so than by the story, and the animation brings this world to life in vivid detail.