The best proc gen experience I have had is with minecraft modpack called hexxit.
The world is procedural generated, but then there is a library of ~200+ hand built structures/features that are scattered throughout the generated terrain. So you wander through a forest and find a cave into a volcano full of diamongs but guarded by angry dwarves, then head over into the desert and find a castle with a witch king, etc etc
There are enough hand built things that you don't quickly start running into repeats, and they are just melded into the generated terrain.
There are enough hand built things that you don't quickly start running into repeats, and they are just melded into the generated terrain.