I'm not a die hard fan of either Star Trek or Star Wars, but when they go into an old movie or television show and replace old effects, it really seems to depreciate not only the movie's nostalgic charm, but its historic value - the intrigue of seeing the gradual evolution of special effects and film techniques over time.
It's not just that a "childhood is being raped," as those subjective memories will always exist as personal experiences, but that present and future audiences will be deprived of viewing these things in their original form. They won't be given the chance to contemplate and appreciate those periods when claymation was cutting edge, hanging miniatures thrilled audiences at Ben Hur, the scale models of Fritz Lang created a futuristic industrial Metropolis, and the Lucasfilm team revolutionized special effects in his basement.
We
could track down the remaining reels of Gertie the Dinosaur and replace them with CGI generated, photorealistic images to the best of our ability, but how would such defacement of an important work of art, and the denial of our own past ultimately benefit us as a culture?
So yeah, I don't like this.