The Judgements of the Just talent on Paladins. Wasn't aware that also counted as a snare type of effect as well, but makes sense now that I think about it (sort of).

It doesn't make much sense for both Arcane and Frost mages to go without getting the Torment of the Weak talent, since it's both easy for the Arcane mage (you are already at least that high in the tree) and Frost is constantly applying their own snares so it's always in effect (except perhaps the very first hit). My opinion is that fire should get it as well, because you probably want to get that far anyways for the Arcane Meditation, use Flame Armor all the time (crit buff), and just grab Glyph of Mana Gem if you still need to suppliment more regen. Plus, there's talents the whole way up there that help all three classes (occasional mana-free cast, more damage, more crit, etc).