Funny, I"m the opposite of you all. when I was single, childless, I'd eat lunches out at work, but generally ate in. Now that I have a kid, we eat dinner out maybe 2x-3x a week, and I eat lunch maybe 2x a week as well.
With a crazy schedule and lots of healthy options for carryout, we tend to do it a lot. (Last night, we were out running errands until almost 9, but elected to eat a late dinner since I'd bought some salmon.) But we do fast food maybe 1x a month, if that. We're really getting away from that.
My dd isn't one for doing much sit-down eating out. That's why we do it at Disney!