Yep. Unlike some people, I am still alive as of this writing. Also, I finished the single-player campaign in Portal 2. The game itself felt too short, even at more than double the length of the original; I don’t think they could have made it long enough to do it justice. The ending was suitably weird, even compared to the original. I won’t link to it here due to massive spoilers (you can find it on YouTube).
Some backstory can be found in this comic about Doug Rattmann, the delusional Aperture Science engineer who survived the events surrounding GLaDOS‘ activation.
EDIT: Okay, okay. Since those last two links at Combine OverWiki also contain lots of spoilers, here is the Portal 2 ending video. But it will make absolutely no sense if you haven’t played at least through Chapter 5 of the game.