Pass the Ball Like FC Barcelona

Maybe I just don't understand passing the soccer ball at the professional level.  It seems to me, keeping the ball on the ground rather than bouncing it to your teammate would be a basic skill mastered by all professional soccer players.  However, it seems only a handful of teams really have this skill mastered.  Watching MLS makes me think this must be harder than it looks. 

With my girls, I really emphasize:

• keeping it on the ground when you receive the ball by doing the "cheese grater".  
• keeping it on the ground when you pass it by keeping your toe up as you kick it.  

It doesn't seem that hard.  Why is it so uncommon to see good passing on TV matches?

-Bill