I'd phrase the difference slightly differently.
If you break down the plot of an OT Star Wars movie you could probably get it into a sentence or maybe two and you would get the broad sweep of the story.
If you tried to break down the plot of Charlie X you might have to use more words the episode is a fraction of the running length of any Star Wars film and it's one episode of the show.
If you were to try to describe all the characters in and locations and objects in a Star Wars film you would need to write a book.
If you were to do the same for Charlie X you could probably do it in a few pages and if you crossed off objects and environments used in other episodes it would probably be a few lines.
The environment of Star Wars is the real content, it's a simple story told with conviction by a well chosen cast playing likeable characters, but what gives Star Wars the edge is it's placed in a richly detailed, tangible, reasonably believable world.
This is why people get so hot under the collor when Lucas scribbles over it without due care, it breaks the bit of the universe that is the main content of the series.
Rewind to the notion of writing down the plot of the OT films.
Try doing that with a PT film and have it make sense, this is the other problem Lucas has made for himself.
His plots have become unnecessarily complicated and muddled, his environments have become not sufficiently distinct and lack tangibility and his characters aren't that likable.
As for Star Trek in a wider sense, people are more likely these days to be able to identify members of long gone boy bands of the same era than any of the characters from DS9, Voyager or Enterprise.