Agreed.
Quote : "It's like ten thousand spoons when all you need is a knife"
That's not ironic. That's just feckin' annoying! It would be ironic if you later discovered you needed a spoon to stir your tea with, having just spent half an hour looking for a knife in a big pile of spoons...
-edit-
Anyway, "It's like..." isn't an irony, it's a similie ;-)
-/edit-
Of course its a double joke - as you suggest, the real irony is that she didn't know what irony was when writing the song...
