The 35 second clock is a huge equalizer in the college game. It basically allows lesser teams to slow their offensive sets down and provides an extra 11 seconds to work the offense to find the right pick, cut, pass, whatever. The beauty of the 24 second clock is that once your primary set breaks down, it's up to one person to create. With the talent in the NBA, which even though there are great and terrible teams the talent level is still really high, it's awesome. With the huge disparity in ability in college, it would significantly reduce the "upset."
So, I hate the 35 second clock because it can make college basketball excruciating to watch, but I see the need and reason for it.