Well, there must be SOME reason the place is called Unique Airport Zurich.....
I flew to LSZH on a regular basis for about 5 years from 1990 to 1995 and occasionally thereafter and found ATC quite accomodating. All this was in turboprops and we usually got good service and even a special visual departure out of RWY 28 to save departure miles.
The situation with Germany has worsened things quite a lot and some of that seems to be the fault of Swiss politicians who felt they could bully Germany into accepting something for nothing......
I was always amazed how efficient ramp servicing in ZRH worked with quite a low number of staff for cleaning, loading, etc.