I loved Blade Runner, like you I saw it years after release, and like you there was a certain familiarity to it - but watching it I felt it was clearly the superior effort. Many of those repetitions since really dont come close to the quality of the original. And that quality really does make it stand above, even against modern standards.
I wanted to love it but I didn't as I thought the actual story was a bit weak. Films I saw (way) after the release and loved Alien, Aliens, Clockwork Orange, Laurence of Arabia - so its not that I cant appreciate, but just didn't in the case of Blade runner as it was so much about style and feeling -imho.