Dinner took long enough that we missed the movie, but that was okay; we weren't sure we'd stay awake for the whole thing anyway. Instead we walked up to the Book Table and wandered around in there for a while, and I even bought a book, and then we walked back and it was all nice. I don't know if date night's the sort of thing that could save a relationship in real trouble, but for adding a bit of communication and warmth to a harried middle-aged-with-kids-and-jobs relationship, it's pretty darn nice.
Relationships need regular attention and care, so I think date night is a good idea.