All that sounds like so much fun! One Halloween in the future I may need to take a trip to the east coast.
Here in California we have Knott's Scary Farm, Disneyland does Mickey's Not So Scary Halloween Party, SeaWorld San Diego does a Halloween Spooktacular, and Universal Studios has their Halloween Horror Nights.
I don't have the nerve to go to Knott's Scary Farm but I've heard great things about it. If our passes covered Scary Farm I might consider it but it requires a separate ticket.
Disneyland's MNSSHP is a lot of fun. Everyone dresses up and they turn down all the lights in the park, put up special lighting packages, there's rolling fog all over the place, the villains are out, and you can trick or treat as many time as you want (or can carry haha) but it does require a separate ticket.
SeaWorld's Spooktacular is on weekends during the month of October and is included in regular admission price. It's a nice day out. It's during the day so you loose a lot of the Halloween feel. They have one area set up with some characters to pose with and Halloween props. The trick or treating is as much as you want but has never felt as encouraged as Disneyland is. Also, not many adults dress up for it.
Universal's HHN looks amazing but I've never been. A friend of mine worked for it last year and he says it was one of the best experiences he ever had.