I think what a lot of people consider NOT having date nights is what we consider date nights. When we had kids it was putting the kids to bed and specifically planning to spend time together doing something special - watching a movie we've been looking forward to together, playing a game, specifically planning a romantic evening, etc. We had a lot more "date nights" than "nights out on the town." Now as empty nesters it still means basically the same thing to us - choosing to spend time together doing something that is beyond the norm of daily life.
For example.... We walk together daily and wouldn't call that a date, but when we drive to the park to walk it feels special and we would call it one. We eat together daily, but when I make an unusual meal that makes dinner feel like a special occasion or we decide to go out for something different than the norm, we consider that a date. Making an effort to do something different = date to us, not going someplace fancy.
Sometimes running errands together rather than each doing them on our own is a date. We have simple expectations!