I always do because:
1. Sweet doesn’t mean it can’t be sweeter
2. That’s what my mom and my grandmom did (which is probably the most important determinant).
I also put some milk in the water. See #2 above.
I also salt it very heavily with table salt (not kosher), and some pepper, but the real treat is to put a couple of tablespoons of butter on a piece of bread, hold the bread in one hand, set the ear of corn in it, then run the corn back and forth, turning around and around, to coat the corn it melted butter, simultaneously buttering the bread, getting it soaked through and sopping wet.
When I was a kid, I’d occasionally get in trouble for buttering an ear that way, then putting the ear back on the platter, and just eating the bread, one slice after the other.