At least for Berlin I can attest that helicopters, outside of the yellow ones for emergency care, are a very rare occurrence. I have yet so see a police helicopter outside of a large demonstration.

They're used in Berlin, though they're surprisingly quiet compared to the emergency care ones. Maybe flying higher? Here's their POV:

https://www.youtube.com/shorts/U3mncVE1TQ0

Unsurprisingly, the comments are mostly making fun of them for wasting tax money on hunting down some guys with spray bottles.