There’s one close to us called Shocktoberfest that has a hayride, and a bunch of other things to do, like Zombie laser tag, a zombie prison bus, and a traditional haunted house attraction. (It’s in Berks rather than Bucks though)

Thanks for the lead but I don't think that's the one. This was from the 90's so it may have either folded or it goes by a new name and I just do not remember the exact location. But I have the vivid memory of the queue, located in this depression amid the trees.