I have visited this Starbucks drive-thru almost every morning for the last 2 years. It used to take 5 minutes to order and get through the drive-thru, today it took 20 and averages 15 minutes other mornings. I typically visit between 5:50am and 6:10am. The staff is friendly enough, but too slow now for whatever reason.
It is the most convenient coffee/breakfast stop on my way to work, otherwise I would go elsewhere. I'm tempted to stop being lazy and make my own coffee/breakfast simply to avoid the hassle!