I've camped here three different times now (twice in December and once in April) and loved it each time. Trees are HUGE in this campground and the sites are fairly private for a car campground if you find the right site. Campers seem considerate and noise has never been an issue for me.
Large sections of the campground are closed to camping during the winter and spring but you can still walk through those areas (nice if you have a dog). The campground is right on the Smith River too, so that's another bonus.
Make sure to drive the nearby Howland Hills Road when you visit too! The road winds through a fabulous stretch of redwood trees and is spectacular.