That's some weird selective memory you have there.
"slight resolution difference and extra patches of grass"
The actuality of it was that it was 720p w/ 2xMSAA vs 640p w/an AA that blurs the entire screen. There was a difference in foliage, but there was also a performance difference as well in favor of 360. PS3 version was missing some shadows, lower quality water effects, more aggressive LOD culling, shorter LOD distance, lower quality shadows and self-shadows, etc etc
But, nah, screw all that, just push the narrative that it was only resolution that mattered. Resolution has always mattered to a degree, but that doesn't mean all of those other aspects are not of equal note (I'd say a consistant framerate would be a more important metric to raise hell about).
Quote from the end of said article, "Play on PS3 without having seen the 360 version and it's difficult to imagine that the fun factor of the game has been massively impacted."
..I'm sure if you switched XBO with PS3 and 360 with PS4 and you saw that in a current article you'd have people losing their damned minds, claiming that they're downplaying the differences.