The bit highlighted part I would disagree with as it's not really like Space Mountain is it especially if we're looking at the technology is uses as you clearly are? I mean if we're arguing that then we may as well say that every ride using a screen is essentially the same and that all the roller coasters outside are all the same. We may as well say the still being built Epic Universe is just a park copying IOA and US which it clearly isn't.
Space mountain is in indoor roller coaster in the dark. Space Mountain doesn't go backwards at any point, it doesn't reach the speeds Cosmic Rewind does, it isn't as long as CR is, it doesn't have vehicles that spin like CR does and to the point you're arguing it doesn't use the technology that CR does. If we're arguing something is essentially the same to that degree then we get to the point where we may as well say Jurassic Park us 'essentially the same as Pirates' as they're both boat ride attractions including animatronics.
The technology may have been used before but the award it won which triggered this conversation wasn't in any way related to 'the best ride using unique technology award' so it just seems a bit strange mentioning it. I think when people refer to it as unique it may be because they've personally never been on a ride using that technology before? However it could also be that they mean they've never been on a ride using that technology that also utilises the storyline, the music, the darkness and the screens in that way combined? They're possibly referring to the whole experience rather than dissecting the technological aspect of which screws and engines were used and letting that somehow spoil the experience the ride allowed them to feel.
It's subjective as to whether people enjoy it or not, as is whether it deserved the award or not. It's just whenever we read "It's just a coaster in a box" it usually is an argument that would make 99% of attractions the same and just feels a bit of a lazy way of sating that the person saying it doesn't like the ride.