Because I detest crowds, I see most movies during the day, at least a week after opening. As you can imagine, there were very few reactions at all, and nothing comes to mind. That said, there were two notable exceptions that I did weather the crowds to see: Star Trek VI in '91 (which was the second trek movie I saw in theaters), and JJ Abrams' Star Trek in 2009.
Star Trek VI was just amazing. People started lining up more than eight hours before opening to get in. The line wrapped around the theater three or four times. Everybody was jazzed to be there.
I remember lots of shushing when the Paramount logo began, and more than a few murmurs if intrigue with Cliff Eidelman's very mysterious score started playing. Cheers for the first appearance of Captain Sulu. Laughter at "Only Nixon could go to China." A mix of shock and agreement at "Let them die!" Chuckles as Valeris reminded Kirk about using thrusters in spacedock. After that, it was mostly quiet until McCoy's "What IS it with you anyway?" which provoked loud guffaws. Cheers for "Target that explosion and Fire!" and tears and sniffles at the final signatures appearing on screen. And not one person left until the credits had finished rolling.
Star Trek '09 was really quiet after the opening teaser. You could feel the energy from everybody in the room during that act. Lots of murmurs, and talking, most of it positive. One person I recall saying "They really got the feel of Star Trek with this. It's amazing!" There were even sniffles as George Kirk heroically met his end. After that, though, almost complete silence. No laughs. No cheers. No leaning in chairs. Nothing. The next thing of note I recall about that film was in the bathroom after it ended; a couple of kids talking like a pair of street thugs, saying that 'this Star Trek shit ain't half bad'."