Just to add to what has already been posted, Most of the lines are wheelchair accessible thru the regular line (called Mainstream Lines).
The information in
italics is the information about
Mainstream Lines from the WDW page about Mobility Disabilities:
Walt Disney World Resort strives to provide mainstream access whenever possible; that is, all Guests utilize the main entrance to the attraction. However, accessibility varies from attraction to attraction within Disney Parks. The Guide for Guests with Disabilities and Park Guidemaps use symbols to indicate boarding procedures for each attraction. In addition, Guests should contact a Disney Cast Member at each attraction before entering. Mainstream queues can be found at these attractions at Walt Disney World Theme Parks. (it then goes on to list the Mainstream attractions).
Most attractions for all parks are listed as "Enter through standard queue" for attractions without Fastpass or "Obtain a FASTPASS OR use Standby Queue" on the new Guide for Guest with Disabilities maps for each park I picked up in October 2010. There is also a large red box on the maps which says "Guests with any mobility or queue related assistance needs are encouraged to use the Disney's FASTPASS option where ever possible." There is the same explanation about how to use Fastpass as on the regular park maps.
These are the attractions in each park with a different method of access other than the regular line, as listed on the map:
MK
WDW Railroad: Enter using ramp on the RIGHT on Main Street
WDW Railroad: Enter using wheelchair ramp on RIGHT at Frontierland
Big Thunder Mountain Railroad: Obtain Fastpass or see Host for options. If FASTPASS is not available, enter thru access on RIGHT
Country Bear Jamboree: Enter thru door on LEFT
Hall of Presidents: Enter through door on RIGHT
Liberty Square Riverboat: ENter through exit on RIGHT or LEFT
it's a small world: Enter thru standard queue. Follow directional signs to designated load area
Peter Pan's Flight: Obtain FASTPASS or see host for options. If Fastpass is not available, see a host for options.
Snow White's Scary Adventures: Enter through Exit on RIGHT
Cinderella's Golden Carrousel: ENter through exit on RIGHT
Dumbo: Enter using ramp on RIGHT
Tea Party: ENter through exit on RIGHT
Barnstormer: Enter through exit on LEFT
Space Mountain: Obtain a FASTPASS or see a host for options. If FASTPASS not available, enter through queue on RIGHT
Epcot
Spaceship Earth: Enter through the exit on the RIGHT or LEFT
Gran Fiesta Tour Starring the 3 Caballeros: Enter through the Standard Queue. Follow directional signs to designated load area.
American Adventure: See a host or hostess for access to second floor
Impressions de France: Enter through LEFT side of entrance hallway
Studio
Great Movie Ride: Enter through the Standard queue. A host will provide directions in the pre-show area
Studio Backlot Tour: Enter through the standard queue and stay to the RIGHT
Fantasmic: Enter through the standard queue and stay to the RIGHT
Animal Kingdom
Wildlife Express Train: Proceed through standard queue. A host will direct boarding
The Boneyard: Enter through the designated access gate
Everything other than these attractions I have listed say to enter through the mainstream or standby queue.