> Level scaling inside dungeons and most overworld territories has been adjusted in World Tiers III and IV. Monsters will begin to trail behind the player in Level after a certain point (up to a maximum of 5 Levels behind). This change does not affect World Bosses, Legion Events, Fields of Hatred, Helltide, or Nightmare Dungeons.
Due to the nature of level scaling, if you're 5 levels over an enemy you basically vaporize them. There is still level variance among the world zones as well. So with the combination of the two, you should always be able to find someplace a bit more challenging and when you're higher level you can find areas with lots of enemies lower than you. I haven't played enough post-patch to know if it's made the experience any better, but I'm not the type of Diablo player to seek out areas with weaker enemies.
What Blizzard wanted to avoid is having 4/5ths of the map no longer relevant because you're so far above the area level that you no longer get usable XP, loot or gold. In D3 there wasn't much to do at the high end other than run rifts. In D4 the entire world is a viable place to spend time during the late game.