I've done 2 weeks in an RV. It was a lot of cooking and cleaning, but that was the plan all along, since we were camping at a state park. If you have to spend a lot of time inside the RV, it's definitely cramped. But that's not really the point when we're camping, the object is to spend as much time outside as possible, living in the outdoors.
It's not anything like vacationing on a cruise ship or in hotels, where you're specifically paying someone else to do the cooking and cleaning.