The 67-year-old coach insisted that the scoreline was somewhat flattering towards his side, but lavished praise on hat-trick hero Mario Gomez.
"Wolfsburg made it hard for us for a long time, very hard, especially in the first phase, because in the second half we definitely played better and took advantage of their mistakes," he told reporters.
"You have seen that we have three top strikers. I'm happy for Mario that he has managed this hat-trick.
"You can say we have achieved our goal but we did make it hard at times for ourselves. I made it clear during the break what I wanted and what we must change. I think that this was well received."
Bayern will play either Stuttgart or Freiburg in the final of the competition.