And thank you for the article. Sometimes you don't know what you don't know until you read it. ;-)
Busch Gardens has no "dark rides" that can accommodate wheelchairs/ECVs such as WDW's Haunted Mansion or Great Movie Ride. All rides are action rides i.e. coasters and water rides and small carney rides. The tiger area has one small, one person 'pop your head up through the floor' view spot enclosed by glass inside the habitat unaccessible to chair bound people. You have to climb down stairs then up a ladder to get to it. It is big enough that an adult can carry a small child up. Everywhere else is OK.