Blueprint is for decision making and c++ is for implementation detail.

Long time ago, I created a tool that is allow you to create a FSM visually. 

<PAI Design Tool. I created it long time ago. more detail http://www.thisisgame.com/webzine/series/nboard/212/?series=99&n=57612 my article here.>

On PAI, game designer focus on the decision making and programmer(me) focus on the implementation detail.

When I use blueprint and c++ in unreal engine 4, I have same feeling now.