Disney has shared a video showcasing the recently returned Matterhorn Mountain Climbers at Disneyland.  The mountain climbers add to the immersive environment, and add a sense of nostalgia as well.  Many long time guests of Disneyland will remember seeing the Swiss Mountain Climbers when they visited Disneyland in years past.
The Matterhorn Mountain Climbers will be around through Labor Day, 2012.