Some of the North American perception of really great European transit service is because we're using the systems for different purposes. Many of the suburbs have little interest for tourists. A few years ago I went out to Hönow, a suburb of Berlin, by riding the U5 and found the biggest bicycle park-n-ride that I had ever seen, probably built when this was part of the GDR. It was little used. I walked to the interesting village center. A suburban bus was an alternative, but it only ran every two hours. After a look around I walked back across the city limits to the excellent transit service.
The suburban buses are better patronized than their U.S. counterparts, partly due to the school ridership mentioned above and the price of gasoline (and the subsidized price of Diesel in the bad old days).