With the new Roiling Blood and Chillblains being available you can now kite mobs similar to Frost DKs do it on live as Blood spec. You obviously do less damage while doing it and it's a bit trickier to pull off (not much though - with some practice anyway :P) but it's still great as a Blood DK. The start is a bit messy because you need to pull all 3 seperate packs to start so if you already got them bunched up (like you will in raids, i.e. Maloriak adds or Magmaw worms) it should be no problem.
DnD, even though it was glyphed to snare, was not used because it kept crashing my client. You obviously want to use this on live. Another thing you can do is Death Grip every 30 seconds to renew your Death Runes, then Outbreak the same mob and resume kiting it (see roughly 0:35). Alternatively, keep one mob unsnared but diseased and close to you and use this mob as a "beacon" to spread your diseases off of. (The effectiveness of this obviously depends on how hard a single mob hits.)