I've also wondered many times why the WDW version is so hectic and crazed, when the Disneyland version is noticeably well-managed and orderly. What I don't enjoy is the WDW Mansion CM's bellowing and barking orders at everyone in the queue; totally out of character and totally rude.
At Disneyland the maid or butler staffing the similar positions quietly and politely shepherds the large groups of people onto the front porch, then into the foyer, then into the stretching rooms, and then the attraction design itself takes over from there. At WDW it's a screaming hostess barking orders to a maddening crowd who don't get it.
Let's hope this new queue at WDW solves some of those problems, and they gave Disneyland a call and asked how to manage a Haunted Mansion pre-show queue. This new queue construction has all sorts of possibilities for interactive special effects and such! :animwink: