The one big thing I've noticed, is waking up on this past beautiful spring weekend, and sitting outside with my dog, cup of coffee in hand, sans hangover, and seeing and smelling things I was to hungover to notice before.
The smell of the tulips just blossoming, the sound of birds chirping (normally they would annoy the hell out of me because the chirping made my head hurt), the smell of fresh grass with dew on it.
Hell, even the smell of dog poop seems better! 
Mostly, I enjoy my mornings. I've always been a morning person, but now, they are even more enjoyable.