Well i can't really comment on this, i've never fought the cockatrice NM thingy.
I did however fight some spider NM in abyssea that dropped a seal for ninja and dancer, and would have never been able to kill it had I not used my healing spells to keep myself alive
Look - if you dont' want to heal on your paladin and think it's a waste that's your business. I think it's silly and see no value in playing a Paladin if you aren't going to use your healing spells, but that is - afterall - just my opinion. There is turning into a dead end argument, case you are never going to convince me healing isn't worth doing and I guess i'm never going to convince you healing is worth doing.
Let's just agree to disagree on this one.