I think the reason I've gotten in to tree identification and biology is that for 12 years my wife and I lived in our first house that had a single, planted live oak in the front yard. 1 tiny, poorly maintained, pathetic little tree. Like most young and broke couples, we bought a tiny track (not sure on spelling there, is it track or tract?) home and I certainly didn't have money or time to nurture a planted tree. We moved a few years ago and when we were looking for lots to build, I told the developer to take me to the lots with the thickest stands of mature trees. I'd lived 12 years without trees, I needed to make up for it.
I guess that started my fascination. Bought a couple of "trees of texas" type tree ID books and began going around the property trying to ID the trees. Had an arborist come out, check my ID's, talk about common diseases, maintaining post-oak health, etc. Best 75 bucks I've spent in a long time. I've got a great variety on just a 1.3 acre lot. I live in B/CS so we've got plenty of post oaks, but some beautiful mockernut hickory, winged elm, a gum bumelia, a huge stand of flaming prairie sumac (one is 25 feet tall which is pretty rare), and even an eve's necklace. The arborist told me it was the first eve's necklace he'd ever seen around B/CS. Of course, we are loaded with yaupon. Some arborists think that it's beneficial to leave a good stand of yaupon around your larger post-oaks and of course leave the soil natural and undisturbed, as the oak and yaupon may have a symbiotic relationship.
I've got a 4 year old son now and it's great walking around with him and ID'ing the trees. I'm also a huge history fan and I often like to sit out back with an adult beverage at sunset and look at the canopy of post oak's and hickory, listen to the crickets and owls, and think what my property (and the whole area) looked like two or three hundred years ago when it was the southern end of the comancheria and all the mature post oaks and hickory that tower around me were just saplings. Helps keep things in perspective.