My neighbor and I have separately found ourselves within a few feet of wild pigs on quite a few occasions.
I'll admit I have no experience with Texas hogs, but when it comes to central Ca. hogs, and Ohio hogs, you have about as much of walking into the middle of a group of them as walking into the middle of a herd of deer. They smell or hear you coming a long ways off, and are long gone before you get there. They are a very wary animal here, and difficult to hunt, even for the skilled. Maybe you live in an area where people feed them and they don't get shot at, making them act like "park deer" or something, or maybe the general population of Texas hogs has developed a lessor fear of humans in general. I've just not heard of it.