Sperk - practically the only people who got the disease are Germans, German tourists visiting other countries and people who have been in Germany recently, It's only linked to Hamburg, nowhere else in Germany or Europe.
Additionally it's very easy to protect against it in the EXTREMELY unlikely situation that you should encounter it; simply don't eat unwashed cucumbers. So I'd say a wholesale ban on vegetable import from the EU is an overreaction, when if fact, only one veg from one small area is affected and there is an easy preventative method anyway.
But EU is overreacting to Russian issues all the time... so they are doing the same here.