Foreshadowing in "Empire Strikes Back"

I recently watched the Empire Strikes Back, and I've seen people go crazy all over the internet about the Darth Vader reveal towards the end of the movie...

Honestly, I feel as if I already knew that... For me, the brief scene of Darth Vader and Emperor already foreshadowed/hinted at the reveal when Emperor says "search your feelings" so the reveal did not come to me as big of a surprise as it did to many people...

Please tell me I am not the only one