:) Still, two syllables instead of one.

I suppose if I found myself writing "2 * pi" or "4 * pi^2" a lot, I might throw in a dash of tau here and there for brevity. Otherwise it's all the same to me.

Though in fairness to tau, one can always choose a pithy question whose answer is shorter either way, to wit:

What is the area of a unit circle? Pi.

How many radians are in a circle? Tau.