Wait, Enhancement, and Arms, and Combat, and Hunter, are those the 3, long-lost Death Knight specs? And the Hunter-Dk class-hybrid? All you're doing is comparing what Frost to offer 4 other classes.
Mind freeze is available yes, but being able to interupt without having to worry about building (or using) Runic Power, that is for Frost (And before you spout off that it's a Tier 2 Talent, no Unholy DK is going to sub-spec frost)
Chillblains is great for Nefarian, and Cho'gal, and Conclave, pretty much any fight with Adds that need to be Kited or Slowed.
I suppose Ebon Plague-bringer is much better "utility"