I have the same problems getting my mages to face the target sometimes as well (I'm too lazy to fix things up properly at the moment) so usually I'll just walk a bit closer toward the mob and then hit the /follow macro and they turn around, then its go-time. As for the stacking up, I'm using a /follow macro so my alts stack up behind my main. I'm not sure if you can set the follow distance through the wow interface settings or not. Perhaps he was actually moving all his characters with key clone instead of using a /follow macro?