"25 yrs married and 30 yrs together this year and the wife and I still enjoy spending all our free time together. "
Same here except 33 years married and 41 years together. I've been hiking/backpacking without her just a few times, in each case she wanted to go but couldn't for some reason. Hiking together is an essential part of the experience, I have little desire to go alone or just with friends. Our next big backpacking trip will either be to the PCT in Washington, the Grand Canyon, Denali or Colorado. And one day we're going hiking/backpacing in New Zealand.
Similar remarks for my kids, all grown up now When they were young vacations without them seemed like they would feel empty, so we always went as a family (including 14 days on the Wonderland Trail around Mt. Rainier).
On the other hand, many of our friends relished the opposite.