Well you can also use it as a GCD, as well as a junk buff for mobs that dispel.
It's also mana you don't have to cast for keeping regrowth up (even AFTER you get the spell.)
Is it something you'll keep forever? Probably not.
Is it something that will make a noticeable difference in your levelling? Probably.
As for the snare effect, you can click it off easily enough. How often are you moving around during a fight? I don't think it's a big deal, assuming you have the SoW boots to click on in case you're needing to run somewhere "in a hurry"...
Is any of that "worth it" to you?
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