The Bundesliga champions recorded a 3-0 victory over the Catalan giants at Camp Nou to make it a 7-0 aggregate triumph, pleasing an extremely proud Heynckes, who admits the win was made easier by the absence of Lionel Messi.
"I think it was clearly noticeable that my team entered this game extremely focused. We played great right from the start," said Heynckes, whose side will meet German rivals Borussia Dortmund in the May 25 final at Wembley.
"My team understood our tactical approach very well and they executed it perfectly.
"Dortmund deserve to be in the final, as they are playing a great season as well. Sure, it's a small surprise that they reached the final. I obviously hope that we can be successful in Wembley.
"I know Spanish football very well, especially Barcelona. I know the way they like to play and their philosophy.
"However, there is no denying it - Barcelona is a different team without [Lionel] Messi. Still, I'm sure no one expected us to win 7-0 on aggregate."