There is a tradeoff based on how long you see something and how complicated you make it. Billboards are designed to be read in a few seconds. The difference is POTC. Walt wanted the conversations to be continuous, like mingling at a cocktail party so you got the sense of the action but perhaps did not get every line thrown out to you. In those dark rides, a single line can set the tone like "C'mon everybody here we goooooo" from Peter Pan. "Apple dearie?" or similar. It does not take much. However, the illusion of life versus cardboard flat or plastic doll is the first hurdle then you deal with what it says if anything. If the character does not "come to life", who cares what it says? You want the Queen of Hearts to be real, not a static figure with a voice talking. It would be better to just have her going "Ahhhhhhhh!" with her mouth open and not draw attention to her limitations by adding dialog, no?. AA figures have a limitation on how long they convince you they are lifelike. Lincoln is better than Ariel. It used to be that you could only get about 45 seconds in those Bear Band type shows where the characters sing for you before you need to bring up something else.
With regards to using audio with limited motion figures, I would say that any audio adds to the reality of the ride, and allows the guest to more actively imagine the world they are in. Sure, its not perfect having a static figure talking without the lips moving.
Interestingly, the voice actor who voices Alice in the film was located in southern California, where she was a teacher, and was hired to voice lines for the Disneyland ride. The film sure doesn't have Kathryn Beaumont saying
"My adventures in Wonderland began when I followed the White Rabbit down the rabbit hole. All of a sudden I fell! . . . down, down, down."
Same thing with the voice of Peter Pan and Wendy (also Kathryn Beaumont) in the Peter Pan ride, they were hired to come back and add lines for the attraction, such as the "
C'mon everybody here we goooooo!" line in Peter Pan. The voice of Mater, Lightning McQueen and Luigi were hired to do some great work in Carsland.
But with Mermaid they didn't hire Jodi Benson (Ariel) or Pat Carroll (Ursula) to do lines for the ride as they just recycled songs from the film! Sure, they hired a voice actor to do some new Scuttle lines, but if, for better or worse, you've seen Mermaid half a billion times, you instantly recognize the original song soundtracks. I think it would have been *awesome* if the hired Jodi Benson to voice some lines, such as "
Would you like to visit my world under the ocean?" or even, "
I see you've a thinga-ma-bobber there! I'd love to visit the human world sometime." Instead of just, "here's Ariel singing her song, you've seen it before, in fact, this is the same scene from the film." I think having characters in an adventure different from the film makes them more "real" as you're not simply regurgitating the film, but seeing them in "real life" as if on another adventure.
In general, I think that simply replicating scenes from a film doesn't work for a ride because a film has a different tempo than a ride in that a motion picture has more time to win over the audience and make the story plausible and interesting.
Lincoln, IMO, uses careful lighting and a super serious speech along with it being a president that is pretty much adored, in order to get the guests to watch in respectful silence. The auctioneer in Pirates is on the same level, and the trick there is the very non-politically correct idea of auctioning off captured women, which is outlandish enough to distract from the mechanical nature of the scene. I think the most effective pirates in the attraction are actually the limited motion ones sulking off in the shadows nursing a keg of ale, such as the guy who is surrounded by cats.