The web is a primarily visual medium. The amounts of information we have to present and absorb are increasing exponentially. When you combine that with a not-so-gentle pressure to constantly move faster, you get a huge response to infographics.
I love infographics. The elegant pictorial presentation of layers of vast data conveying not only quantity and attributes but relationships, applied perspective, and time scale (or time placement) just makes me tingle inside like a librarian among ten-foot tall shelves of books all perfectly arranged and filed.