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It allows me to much easier swim face down in the water, it allows the natural bouyancy of the water to support my head in the water instead of my trying to hold my head out of the water to breath.
It allows me to conserve air while swimming off a beach dive site to an offshore decent point. I can swim a bit of the traverse on the surface, get to deeper water then decend instead of decending immediately near the shore.
I use it when waiting for my buddy(s) after jumping in from a dive boat... I simply put the snorkel in the mouth.. and patiently wait.
For those rare times when diving from dive boats and at the end of the dive while waiting to get picked up by a "live boat"... when the seas are choppy..
Do they even teach snorkel use and skills any more in basic scuba courses?