Indeed, YPAO is super groovy, particularly when you're first starting out. I'm still on my first receiver, had it for about three years, and I still use YPAO when I need a quick do -- like when I've moved furniture or speakers or something, and don't have a lot of time to do the speaker levels myself.
Three years later, I still use it before I do any speaker level calibration. It's a great starting point. Because YPAO doesn't always get everything exactly right. (Although your receiver is newer than mine, so its YPAO may be better.) Mine will occasionally set the centre speaker to large when it should be small, and it always sets the crossover to 120 Hz -- I have to manually change these after YPAO finishes. And I find that for speaker levels, YPAO is either bang on, or within half a decibel of getting it right. So not bad!
Glad you're enjoying your new toy!
cheers,
supervij