Galio really isn't that much stronger than before
The only damage buff he got was to his Q gust base damage and ratio. That's it. He got a nerf to his E damage to minions and his ult damage reduction got removed and the CD got increased a few patches before. He used to be built like a tanky mage. Now people build him full AP. It's mostly the way that people build him that makes him look waaay stronger than before.