Growing up, I was always told that not going to church made it easy to slip up on your walk with God. Having a community of people who have the same goal is useful. The sermons and classes are useful, and help remind you what you need to do. In my churches, you also had some pretty wild worship (singing and stuff) where you could let loose and forget about your cares. You can talk to people who have been through trials. You can get encouragement.
I also note that access to a church community means that, if you have financial troubles, you can call up the church to help. They’ll take up an offering for it. Sure, now you have GoFundMe and such, but that is impersonal and not people who are part of your community and care about you.
Of course, all the other reasons apply, too. There’s no one reason, even for a particular individual. Yes, even the people who read a certain scripture in the Bible and think it means not going to church means they will go to hell.
I do note, however, that things like “I go there to worship God” have never made a lot of sense to me, since you can do that anywhere. Sure, it’s a secondary thing you can do there, but it’s not necessary for that purpose.