During the day, it makes no fun at all and I usually take the less committed bridge a little further north. That also has the advantage that from there you can marvel at the Charles Bridge in all its glory. During dawn, however, the Charles Bridge is absolutely amazing and the various statues welcome you in the silence of a Sunday morning.
As you know, Prague is a pretty unique place for me. I have so many fond memories and I am glad each time when I can walk for a few days through the pretty streets. And of course, each time I have to cross the Charles Bridge at least once.