Is this the issue your referring to? Where you /follow anyone and WoW disconnects as if you clicked a bad item link? If so my heart goes out to you, that problem looks like its in a slog of voodoo for a while.

I find the coding logic behind /follow to be always interesting. Its obviously not just following the other character or even just taking pathing cues from the other character. But there is some upkick in communication that is blizzard to me as well. You can see this in how until recently patch characters interacted when they were walking near each other the speeds would change. Or how /follow-ing a mage would prevent them from blinking.

And if you think about it, pet pathing is pretty damn spiffy in WoW, even though its comical and irritating at times.