I'll be a bit dogmatic (or arrogant?) here but to me at least there is no such thing as shooting too fast or too much. It is all part of the "pacing" or flow of the creative process. Heck, I've used a motor drive to shoot a sunset because the light can change so fast. Slow down? For what? So the other guy can get the shot that you missed because you were pondering some profound creative element in the scene? Also, when you think about it, when did you ever see a pro photographer's work suffer because he was working too fast? That just doesn't make sense. As for too many photos, there is something that happens post-capture that is just as an essential part of the creative process as when you take the photograph. It is called "editing".
I have been really guilty of providing too many pictures and need to work on getting the number down. So my goal for the next shoot is to slow down and get the shot count down to help speed up my processing.