I agree. The best part (and the most memorable for almost everyone) would always be: "Luke, I am your father!" LOL (oh, and that long drawn-out "NOOOOOOOOOOOOOOOOO!" from Luke)
First time I watched TESB, that line is the only thing I remember in the movie.
FYI, even the actors playing in TESB did not know about Luke's paternal origin. Except for Mark Hamill. He knew this and reacted accordingly. Whereas David Prowse's(Darth Vader) original dialogue goes like "Obi Wan killed your father" or "You must join me and turn to the dark side" or something like that. When he watched the movie's premiere behind director Irwin Kershner, he was horrified that his line was dubbed to what we now hear and asked him why wasn't he told! He would have acted like Luke's dad had he known.
The voiceover dubbing actor for Vader, James Earl Jones, when confronted with the actual dialogue was incredulous. He turned to Lucas and say "You're kidding, right? I mean this is a joke, right? Darth Vader couldn't be Luke's father...."