I've always had a soft spot for Valley of the Rogue campground after I caught my massive wild steelhead there last October. It's right on the river, right off the highway, easy to set up and use as a base camp. It's pretty much a grassy RV parking lot, so you wouldn't spend a lot of time there if you were looking for a wilderness experience. But this time it was a lot less crowded and the camp seemed a little more charming.
I've entitled the photo below, "RVs in the mist":
Both times I've been there the staff has been really nice and the old folks who make up most of the crowd are really low key. Not much more you could ask for: Decent fishing within walking distance, inoffensive retirees, good basecamp for other stuff.
If you're looking for good food nearby, PLEASE check out the Circle J in Grants Pass. Awesome.