Look at it this way: if you are afraid of wasps, and wasps are afraid of these ants, the logical rule of transitivity says you should also fear them; trust the logic, or not... and then let me know how it went :)
I don't know how much, if any, was CGI, but that last shot was fucking awesome!
Now, there are ways of fighting them, but you're going to need a hell of a lot of little pie canons:
Hungry for more ant awesomeness?