After a 3 week backpacking trip with no showers, I got home and (after an awesome warm shower) was like, "Why do I do this every single day? Seems excessive." For a week, I was only showering every other day, but then my muscles had rested and I had to get back to some physical activity and....yep, time to shower every day again. I mean, that or wet wipes for the important bits like on the trail. And I'm a female, so just want to admit to that here....even some women get stinky and have to shower more in the civilized world. I still wash my hair much less (1-2x per week instead of every other day), but again on the trail where I didn't wash my hair for 3 straight weeks, I was either constantly under a giant hat or a beanie. Considerations are very different between wilderness and civilization, but it did give me the chance to push a little further to a still-totally-reasonable position of less showering and hair washing when possible.
At home, I loooooove a warm shower, even if it's my standard 2 minutes-ish. On the trail, I looooove not having to worry about my hair and just using a few baby wipes each day.