It’s what gives your video a professional look and feel as long as they are not overused and amateurish.

Animation....Special effects....Custom graphics....Titles 

Unlike basic cuts only editing, tastefully produced special effects adds beautiful transition effects between segments such as dissolves, various multi-layer special effects, slow motion with broadcast quality graphics and titles for some first class professional looks.

Here are a few examples re-edited and condensed from a dance medley.