Halloween - I don't get it?

Would someone out there please tell me why residents of the USA make such a big deal about Halloween. No one else in the world makes such a big deal out of it. It's not like Christmas which is about family, and being nice, and at least you get the day off and a present. Halloween you don't get the day off. There's a buch of horror films on the TV, but horror films are stupid (why would I want to watch a film where all I would be is scared, it's like voluntarily getting major surgery). Trick or treating is just irritating  door bell ringing all night, and the fact that people use Halloween to scare people isn't funny it's just annoying. Halloween is like putting a poo on the end of a stick - a bit pointless.