Is there a cars attraction at Walt Disney World?

No, there is no Cars attraction at Disney World. What there IS, however, is a small "meet-n-greet" picture-taking spot in Disney's Hollywood Studios where Lightning and Mater are at and the kiddies can get their pictures taken.

But there's no ride or show or anything like that based on Cars.

Disney World Cars Attraction

No. There isn't an attraction, but you are able to take pictures with them at Disney's Hollywood Studios. The cars are usually around the area infront of Lights, Motors, Action! Extreme Stunt Show. You can ask any cast member at Hollywood Studios and they will be more than happy to find out where the cars will be.

There's a Disney Pixar Parade where the Cars characters are in.

And there's a photo opportunity with Lightning and Tow Mater in Disney's Hollywood Studios.

When I was there last year, I recall Lightning McQueen and 'Mater parked near a city setting for a photo op at Hollywood Studios.

Check out the link below for a review of the "Stars and Motor Cars" Parade at Hollywood Studios.

There isn't an attraction, but there is often a photo opportunity on the Streets of America in Disney Hollywood Studios.

There was a Cars parade last year at Hollywood Studios. Downtown Disney's main store had lots of Cars toys, exclusive to WDW

No, there isn't a Cars attraction...at least not yet. Who knows what could be coming in the future.