>Maybe it's because I grew up with personal computers ... (early 8-bit machines, then DOS on a PC) that I find it hard to get scared or excited by local-only exploits like these.
In the 8-bit world, if you don't have a hard drive, and your only "network" is trading floppies with your friends, and "Elk Cloner"[1] is the nastiest virus you have to worry about, then there isn't much reason to be scared.
Nowadays, though...if you consider inserting an infected USB stick to be a local-only attack vector, then Stuxnet was local-only.