Man, that really sucks. Any chance it was just co-incidence? I think you'd have to tug on the SATA port pretty hard to affect the CPU solder-job...but what do I know?
Once she's gone YLOD, is reballing the only long term fix? Or does even that fail in time?
It could be coincidence, of course. It did happen about two minutes after putting the drive in though.
On the other hand, I removed and replaced my drive several times that afternoon, so it's not like swapping out the drive once is going to kill it, and just the heat expansion and cooling from turning the system off and on several times in a few hours could've killed it too. But that happened a couple years ago and I babied that system like crazy towards the end. I wouldn't want to touch a launch system that's still going at this point.
I don't know what the success rate on reballing is, but I reflowed the motherboard in a solder baking oven and managed to get another year out of the system until it went YLOD again. Another reflow brought it back, but the blu-ray drive connector fell off so I can't do anything with it now.