Spring-loaded folders

I know I had seen it sometime, and I had even used it, but why doesn't it work now?

I simply want to move a folder from some place to another only dragging it with the mouse, but the destination folder is somewhere deep inside of another folder. I remember that you could drag something onto a folder (don't release the mouse) and the folder opens, if you want to keep digging deeper down into the directory structure keep going. But why the heck does that not work with my Finder? As I supposed I didn't active the spring loaded folders, dooooh! Googling brought me quickly to a page that describes spring-loaded folders nicely (otherwise I wouldn't have known that they are called that way). Thanks!