That's not what I get from reading the MM. It's not a "New and improved Ogre", but an Ogre Veteran or an Ogre Chieftain that becomes the challenge, while you also have a template for Ogre minions rather ones with lots of hitpoints that you saw at lower levels. What's happened is not sliding the difficulty of the monster, but rather that you are moving up the monster food chain to something bigger because you have become that much more powerful.
It's the same concept. You don't encounter ogres at level 10 that would have made you run away at level 1. Even the minions had bumped up attack bonuses and damage even if they did die with 1 hit for convenience.
I still occasionally do the "powered up" ogre thing and always have. But if I do, it's not the same ogre, it's the new-and-improved ogre.