Please accept my sincere apologies for being imprecise.Ah........but you didn't say creeping along in traffic, you said coasting up to stationary traffic, completely different.
Seriously though, one of the amazing things about these cars, is that they sound just as gorgeous doing 15-20 mph through town as they do singing on the open road! (unless of course you coast in neutral)
There's a bit of road near me where traffic slows and creeps along slowly with a lot of stop start due to traffic lights - far less than 15mph. When approaching it I'll let the car coast for a bit rather than drive slowly with the resultant clutch slip.