Inside the Little Plastic Castle

This 4:10 captioned video provides great background on the "wheelchair symbol," more formally known as the International Symbol of Accessibility. Using plain language, the presenter explains its history, application, why it applies to more than wheelchair users, and why it might need changing.

If you're disabled, how do you feel about this symbol? Do you find it helpful in the abstract? Is it deployed usefully in your life? Do you know of any different symbols that don't use wheelchairs?
( video under the cut )