I personally never put much emphasis on holidays when I was younger, being an atheist.
Having grown up, and having 3 god daughters that I routinely spend Halloween with, it's become just a night to have fun. It's not about any ritual thing or whatever. It's a chance for their mother, to express her creative arts skills, making up their costumes. It's a chance for the girls to play "dress up" out in public, and to do it with friends in a social setting. It's a chance to invite other kids over to join in the "pack" to go from house to house, showing off their outfits, and being rewarded with candy for their "spooky outfits!" It's a chance for them to share candy with friends, by plopping down in the kitchen at the end of the night, and play "I'll trade you all my snickers for your kit kats". It's for them to have fun at night, which is normally not something that we do these days in regards to children. It's a chance for the regular neighborhood to become altered and strange, as people put up elaborate displays and front yard haunted houses, playing spooky audio tracks that can be heard from down the street, giving the night a creepy vibe to it, as the kids psych each other up to go through the haunted house. It's a chance to just wander around, in relative safety and ease, passing by lots of new, random people, and commenting about outfits and having fun.
Like all holidays, it's basically just a socially agreed upon excuse to get together, under the auspice of appreciating the company of those around you, and expressing your feelings for them in a positive way.
We have fun, and that's about all there is to it really.