I miss the heated window switch from my mkiv which used to demist the mirrors at the same time.
When I got my mk5 I didn't realise the mirror heaters had been left on by the previous owner / VW dealership I bought the car from. I was well impressed that the mirrors seemed to demist themselves, until my local VW dealer pointed out the mirror switch had been left in the 'ON' position.
Epic fail for me...
Still, the wing mirror spiders were kept nice & warm!!