Most people that I know who make tea make it by heating water on the stovetop, and don't realize or don't care how much better an electric kettle could be; but of course you're right that coffee is much more popular than tea here, and perhaps that's why electric kettles aren't more well-known as superior for heating water.

I do not think it's because of 110V though! Even a 110V electric kettle is far faster than stovetop.