At BTM at MK it's gonna be things like sticks of dynamite and TNT plungers that you can push/pull and it will set off effects in the the main mountain - makes things move, smoke, sound effects etc. I agree about the HM queue elements, they would be rather out of place in the PM queue as HM is much more jovial than PM with its Grim Grinning Ghosts theme, it's not meant to be as scary. I do think interactive queues are a good idea though should they be done well, it's all about enhancing the guest experience so why not make the queuing area more enjoyable?