I have ridden in some place that I don't like but that is a separate thread.
I always liked the Virginia brevets. Good road surface, mostly secondary roads, and can be a bit hilly in patches.
NER is also good except the road surfaces suck.
I've limited experience in Ky but in horse farm and whiskey country, the roads were nice but the dogs weren't.
When I rode cross country, I really liked Oregon although like most Western states, there aren't old farm roads like back east, so, you do have to deal with some areas of lousy traffic. Services aren't too spread out and road surfaces are decent, roads are well graded. Scenery is really nice. It is one place I would like to ride again and am thinking of doing a fast light tour from Astoria to Yellowstone or Breckenridge if I can get fit. But Oregon is a keeper.