I was taught as a kid, and taught my children too, that if a porch light is on, it's okay. If not....don't bother. UNLESS they have other lights and pumpkins and it's obvious they've decorated for trick or treaters.
I think some people leave their porch lights on because they are worried about people pulling pranks, etc and with so many people walking around, they don't want it to look like no one is home. Keep in mind that elderly people might be afraid to have a dark porch and also might be afraid to answer the door. I work with elderly people and we just had a safety training meeting about home security for senior citizens.
If a porch light is on and there are no decorations, etc, we just go to the next house.
Try not to let it bug you.
People are either into Halloween or they aren't and that's okay.
Have fun! Be safe.