Good for you. We all tend to send complaints, but too few compliments. If your transit system is like ours, they can probably track down the driver from route #, time, and place.
I have sent a few compliments as well, including one for the bus driver who put up with my questions as I tried to identify the exact size and position of the bus' blind spot, and how far ahead of the bus I should be to make sure he can see me heading for the bike rack.