I would think so, as well as being unkind on the window rubbers etc, I would rather spend five mins with the scraper !
Just put a plastic bag over your windscreen night before.
or just spray your car with the hose or watercan full of hose water make the ice/frost dissapear!
lol if you spray water on the car... yes the ice that was already there would melt... but surely the water you've just sprayed on would freeze?
Make your own de-icer.
Spray some diluted rubbing alcohol on the screen.