The improvement in my hearing since having Aiden is producing a similar effect. Last week I heard the cat's ears flapping as she shook her head - something I'd never heard before. And just this morning I realized that music played on my laptop's crappy high-end-weighted speakers doesn't sound like hollow gibberish anymore, but actually like *music*.
The downside is that, since my hearing is improved in the range of Aiden's voice, if he's yelling I can't hear anything. else. at. all. But still, I'll take it.