Warm showers is pretty great if you like to check out cities. If you were doing a tour of a very populated area, I could see stringing together multiple hosts every night.
I used WS in Seattle and San Fransisco at the start and end of a coast trip. It would be tough to find camping in those areas that isn't just staying with some homeless folks under a bridge... I do prefer setting up a tent in a back yard vs. staying in someone's home, though. I'm totally up for hanging out with someone in their house and having a beer and chatting, but I don't like the parts around bedtime or the morning. Every home has it's own schedule.