In the past there is usually a photopass photographer (PP) atthese areas, i am sure there are tons more....
Magic Kingdom
on main street as you enter
Toontown barn in the character rooms
on the bridge near the castle, in front of the mickey minnie topiaries
on occassion i have seen them on the street w/characters
Animal Kingdom
Camp Minnie Mickey w/ the characters
Near Dinoland entrance, a landing area w/ pooh and friends
Epcot
Character connection
on the street to get the giant sphere in background
MGM
w/characters on Mickey Ave.
Mickey as the sorcerer
as you enter in front of the icon hat