Well, in my experience I wouldn't exactly refer to it as trench warfare. But there truly are differences in perspective in what is important, what is not between men and women.
For instance, I don't think men have an affinity for talking things out. My husband credits Tim the Toolman for giving him great wisdom (lol).
My husband and I are such good friends that there are few "wars" or turf battles. Marriage is an evolution, and all 41 years have been a wonderful adventure.
It's great that you have that kind of relationship.