When changing lanes or turning you are supposed to use the turning signal before doing the manouver. The turning signal is supposed to warn other drivers that you are going to do something. It doesn't make any sense to use the turning signal when already mid-turning or while already changing lanes. Many drivers don't seem to know that.
Jesus only in Bavaria. But otherwise you're right.
An anecdote: Back when I was studying we had the opportunity to gain a temporary full version of a specialised software. All there was to do was to proof that one is a legit student. We had to submit our proof of enrollment to the software's manufacturer. The only way to do so was to submit it via fax! It coldn't be done with email, as they told us on the telephone hotline. The software was a German product. We already have been overtaken by the rest of the world (regarding the IT sector).