Eventually the film finished, and we all got up, slightly dazed - couple included. The woman said to the man, with pursed lips - "Next time, I'm picking the film" :)
The drive home was about 40 minutes, and my friends and I were silent the whole way. But I'm sure if I saw it again, it would seem adorably tame.
EDIT: I also had the "next time I'm picking the movie" moment after I took my then-girlfriend to see Prometheus. The TED2023 trailer looked so cool and I didn't realize it's a prequel to Alien...
For example, if the timeline of the movie is to be believed, the crew member is only exposed to a vacuum for about 10 or 15 seconds before his eyes seem to bleed massively or explode (actually, an apparent plot hole -- only a few seconds later, he's seen without any blood around his eyes). The article suggests that this wouldn't happen.
At the end of the day, Event Horizon was a pretty gory horror movie and they obviously took a lot of liberties in depicting depressurization.