I can't imagine electric cars are quieter at speed. If at motorway cruising speed I dip the clutch the noise is mainly tyre roar and when I raise the clutch and bring engine revs back up again there is no discernible noise increase in the cabinI've never driven an electric car, and am intrigued by them. If I ever get rid of my current car (which I can't imagine ever wanting to do*), it's likely it'll be electric - and Tesla is a long way ahead of most of the field. (*Manual, naturally-aspirated engine revving to 8.5k, no ePAS etc).
Current car is a B7 Audi RS4 (hence the engine as avatar)- bought it 13 years ago, and it's almost as much a part of the family as the dog. Non-standard now in that it has a little more power (and a useful chunk of extra torque). So that's 434PS and a clean licence. (Sorry JJ!)