The Romanian third seed made it through to the last four at SW19 on Wednesday with a commanding 6-4 6-0 win against the German.
However, Halep believes that the one-sided scoreline does not reflect the competitive nature of the match.
"It wasn't as easy at it looked," she told BBC Sport. "I had a slow start but then I came back well.
"I played my best and I enjoyed every moment being on Centre Court so I am happy I could win in two sets and prepare for the next match."
Halep will now take on Canada's Eugenie Bouchard for a place in Saturday's final.