People like different things. What a shock!
> Same goes for nightclubs, museums, movie theaters, "culture". This is really why people want to live somewhere???
What do you do in the afternoons? Almost every home-hobby I can think of is improved by company of people with similar interests. Rather than do DYI in a garage, I'd rather go to a hackerspace. Rather than play the same N boardgames with the same X people, I'd rather to go a boardgames meetup.
And well, while you might not be into 'culture', there's a reason why nightclubs, museums, theaters, cinemas, etc exist. People like entertainment!
> Get dressed up, drive or walk to the place, wait in line, get seated and wait again, place your order and wait again, finally you get to eat, trying not to think about how much of your life you just wasted, then when you're finally done enduring all that, drop $100 that you could have used to buy groceries for a week.
Well, here's the opposite view. I don't cook at all; I'd much rather place a delivery order at one of 20 great restaurants around, depending on whether I feel like italian, thai, vietnameese, british, american, or any other cousine. Why would I spend hours buying ingredients and preparing food, when someone else can do the same for me, but better?
Going out to restaurants is a bit different - when you go as a group, the fact that you have free time as your food is being prepared is a benefit, not a cost. That's the main reason you go, after all - to spend time together, while at the same time enjoying a good meal.