Short answer, yes a micro adjust is useful on a hunting sight. While you may not use them often, they are far better than the type of pins where you loosen the Allen bolt and attempt to "nudge" the pin a bit. I always ended up pushing the pin too far, then having to go back the other way. The micro adjust allows me to move them very precisely.

After using a sight with a micro adjust, you will not ever want to go back to a less full featured sight.