In answer to the original question you asked, yes, I happen to know for a fact that the Mk3 Volkswagen Golf VR6 uses an electric water pump. The purpose of this pump is to keep hot coolant circulating after the engine has been shut off to prevent hot spots and heat soak causing damage. However, this is used in tandem with a mechanical pump which runs all of the time that the engine is in operation.
If you're looking for cars which use only an electric water pump, then I can't name any. This websites seems to imply that some modern cars have abandoned the mechanical pump altogether but doesn't name any specifically. I could quite believe that some competition cars run electric pumps and that it may be a technology we will see in road cars at some point but I don't know what basis the linked website has for claiming that some modern cars have already forgone the mechanical pump.
Looking at this link to the Gates electric water pump catalog, it woudl appear that I've stumbled across a number of cars that appear to use solely an electric water pump. (Most of these are hybrid cars).
These include; 2013-12 Toyota Avalon, Camry Hybrid; Lexus ES300H 2.5L
Electric, 2012-10 Lexus HS250H 2.4L Electric; 2011-07 Toyota
Camry 2.4L Electric, 2014-10 Toyota Prius; Lexus CT200H 1.5L, 1.8L