Oh, dear god, that transporter room scene. When the crewmen start re-materializing there's an odd, electronic buzz that slowly resolves (almost before you realize what you're hearing) into the sound of the victims screaming in agony. While you're realizing what that sound is, you start to notice the the two humanoids forming on the pad don't look quite...humanoid.
Starfleet Transporter Tech.: Enterprise, what we got back didn't live long...fortunately.
The reading of that line reeeeeeeally didn't help. Gah.
The book is actually WORSE. The crew members actually materialised inside out and were alive to feel it. But not for very long. Fortunately.
And then we find out what V'ger does to the "information" it collects. Poor Ilia!
And if that's not bad, try being kidnapped by V'Ger: surrounded by an incredibly strong electromagnetic /lightning type force that shocks you and anyone who tries to help you. And there's no time to cry out or to say goodbye to anyone you might care about...
"That unit no longer functions." Brrr.
V'Ger's energy weapon, which rather than blowing it's targets up or vaporizing them instantly, instead seems to methodically take it apart. We see three Klingon cruisers get slowly disintegrated this way, followed later by a Starfleet space station which just happened to be in V'Ger's path, with one person in a space suit trying to get away.
And we never learn what happened to that guy. Was he digitized and killed by V'Ger, was he crushed eventually against V'Ger's hull, or did he spend the next several hours wondering which would come first: asphyxiation or hypothermia?
In this movie more than any other Trek production, every aspect of space travel in the 23rd Century IS TRYING TO KILL YOU! The transporter disintegrates the ship's science officer. Crewmembers make extensive use of space suits for EVA. Going to warp accidentally throws you inside an uncontrollable wormhole. And remember those 300-year old space probes? One of them is coming back, and it's dragging a giant machine thousands of miles long that is more than capable of rendering the planet Earth completely lifeless. What's more, it's been sent by a race of machines that don't even perceive carbon-based organisms as living beings. V'ger is looking for God, and if it doesn't find it, it will nuke your planet.