More than any other version, the Original Cast films were MY Star Trek. Sure, I’d watched the show since childhood, but the movies were new when I was in my prime geek teen age years.
The first time I tried to introduce my daughter to them she was much younger. She came in and out of The Motion Picture only because she liked “the bald girl.” I tried to convince her that the other ones were better but she refused to pay any attention, or even come in the room, for Wrath of Khan until she was forced to at lunch time. Of course, she sat down right at the start of the “bug in the ear” scene and vowed never to watch Trek again.
Fortunately, once she aged a bit, and became a big fan as we watched the original series on blu ray, her interest in seeing the movies returned.
However, there was a gap of over a year after finishing the show before we started the films. Star Wars and Harry Potter figured fairly significantly in this gap, but it turned out to be a very good thing for the first installment.