This is a good point, its one of the important things for me when I choose a camera, as I am totally wildlife, I have two cameras at the moment, and both have the capability of 8 fps..mind you, Ive had camera with less and got some decent shots..
Yeh it can make a massive difference. You might get one really good picture just out of pure luck by having it on continuos shooting, a picture you probably wouldn't have got using single shot.