3. Is it worth it? We have done the MNSSHP is it the same?
I certainly think it is worth it. I have gone to every Halloween Party (it has different names almost every year!) I have also attended one MNSSHP and the two are very different, but the same. Florida's event has an awesome parade, whereas California's event has had a Cavalcade. (I am curious to see if this will become a true parade at some point.) Just last year, DL version added the Halloween Screams fireworks show, which now matches MK's event in the fireworks department. You can still trick or treat for candy and last year's CM were VERY generous with the candy. I still have a bag of candy from MHP from last year.
And don't forget, DL has Halloween Time, where the park is decked out for Halloween. Even if this is not apart of MHP, it makes a trip to DL during Sept/Oct a very good time to visit.
There is a great blog about the 2010 Halloween Party here on DIS.
Read it here. It should give a good idea of what was offered at last year's MHP and it has tips, too.
There is a Halloween at DL superthread, where information and pictures on Halloween Time and MHP is posted.
Find it here