It's a matter of figuring out the trade-off between mana saved from healing vs mana cost of slowing (factoring in resist chance). It changes depend on how hard the mob is vs the group, group dps, how much damage your tank is taking, mana regen, etc.
When in doubt throw in drowsy or walking sleep and save top slow only for very hard mobs. You should be able to develop a good strategy w/ practice. I cringe everytime I'm tanking a low blue mob, while I'm at 95% hp, in a high dps group and the shaman hits it with tugurs at 50% hp. Sometimes the mana cost of an additional nuke is better than any slow you could have cast.
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