Most of the US corn crop goes to animal feed, so no you don’t get food from it. At least not directly. If you totaled up all of the land used by golf courses, you’d be at .1% of just the amount of land used for animal feed. And about 1% of the land used by home lawns.

They’re not that bad, there are much worse enemies than golf courses in general. Again, courses that are in the middle of a city that do nothing but increase property value are terrible, but most are perfectly fine and use way less water than you think.