I agree in theory. In practice, the suspension is intended for drivers who refuse a breathalyzer test. As I recall, a driver has a right to refuse a roadside breathalyzer test. If the driver refuses and is later ordered to take the test back at the police station, enough time may have passed that the driver sobers up enough to fall within the legal limit. Of course, the automatic suspension does violate the presumption of innocence.
Thinking about it now, I am inclined to agree with the automatic suspension either on the grounds that driving is a privilege or, if driving is a right, it is subject to greater limits for the common good than certain other rights (like the rights to life or freedom).