Root. Several classes get it, it is crucial CC solo and in many groups, it gets used instead of its upgrades most of the time, it lasts under a minute at max but sometimes only a tick, etc.
If you include bard songs repeating every 3 seconds as spell casts the maybe selos (all those tunnel bards at level 5) or hymn of restoration or something.
Sow only gets cast every 36 minutes and only by a few classes and not indoors. CH only gets cast by one class and is a mana hog and usually only is used on a 40ish+ tank or pet while other heals are used on most classes and in most situations.
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