Depends on the spoiler - reveal or twist (Gaming)

by someotherguy, Hertfordshire, England, Sunday, June 26, 2016, 23:55 (3076 days ago) @ CruelLEGACEY

Finding out X is Y's dog walker may be a shocking reveal, but likely doesn't drastically change your experience with the film itself.

But if a character is revealed to have been a ghost/imaginary/a burrito all along, your second viewing is likely to be a different experience as you watch for clues and catch things you missed before you knew. There's almost two different films in these cases, and having them spoiled essentially robs you of one of those experiences.