Re: a sufficiently motivated person could in fact find out exactly how I voted.
"Because terrorists", You have a terrorist party?.
PS. keep the paper ballots. Where I live we have to prove identity with a drivers licence or passport or ID card and the name on the roll is marked. I don't really understand why that is such a problem in some countries. Nor do I have to do anything in advance and the ballot is not numbered just stamped. The USA is of course a totally different story for many reasons.