Speaking as a healer who raids with a DRK MT, there's nothing wrong with Living Dead.

Benediction, Essential Dignity, Lustrate, Emergency Tactics, Cure/Benefic 2, etc, all a healer has to do to remove the Walking Dead is heal you for whatever your total HP is, you do NOT need to be healed to full HP, if you're concerned use Convalescence with Living Dead and cleansing the debuff is even easier.

If a tank has 20,000 total HP, and uses Living dead and it procs, they now need to be healed for 20,000, if they receive 15,000 worth of healing before the next major incoming hit, then say suddenly take 10,000 damage dropping them back down to 5,000 HP, they still only need to be healed for 5,000 more to remove Walking Dead. For any healer that isn't just standing AFK watching Netflix Living Dead is no trouble at all, even Scholars that have no Aetherflow stacks since they have E-tac to fall back on for one Adloquium + the fairy's Embrace spam on any target below 80% HP naturally.