Why does so many MR items have CDR?

Not counting incomplete items or map-specifics, almost 2/3rds of MR items have CDR. Out of the ones that don't have CDR...
Two are tank-niche only (Stoneplate and Zzrot) Two are AD-focused (Scimitar and EoN. ) One is pretty much garbage (Wits end) And two are somewhat universal (Boots and Locket)
But perhaps what is even more frustrating is that "CDR" seems to be the bandage stat Riot puts on items if they don't do well. Nobody buying Banshees anymore? Slap some CDR on it. Hexdrinker too strong with armor pen? Some CDR will fix that right up. Completely rework Abyssal with new items? Meh, keep the CDR just in case.
Does anyone else feel like Riot has gone a bit nutty with slapping CDR on stuff?