I have yes - at our office I just bought some cloud print enabled printers so that I could print without some quirks in the AD deployment and remotely. That said, I'm sure traction was low - I saw VERY few others using it. Still very annoying.

The more relevant question is: for a new service by Google for which you are a target market would you have any reluctance to use it based on your perceived likelihood that Google will kill in the future?

Based on them killing a service like Cloud Print? No.

I've never used Cloud Print, but I have used Reader and Hangouts that were shut down. The perception that Google has no commitment to their products is very strong and transfers to other areas. I'd rather use AWS or Azure than GCP, because I don't trust Google to continue their services offerings or API contracts.