@farmerman,
Yeah. Maybe my eyes are a bit of luck - I have to pay attention walking, rather in the way you say you do walking the forest. I don't sing though, have quite the not good voice. Once I started studying landscape architecture and then working in it, I was always looking, beside the stumble worry. Sometimes I was looking at landscape from a painter's view. But.. I think I'll mention the kids on my block in Evanston: they knew what all the trees were, even young, and I got into it too. Another thing, I pay attention in cities too, thus my huge interest in italian piazzas over several years of both reading and going, ending up really liking the little ones of no major notice, as they were part of the city fabric. That's what's wrong with our damned stupid housing tracks here in Abq - we need some piazza life, people getting a coffee, getting the neighborhood news, sitting on benches, walking the dog, and so on. Sez me.
Anyway, I've noticed that I tend to look around a lot in contrast to others - not all others, just that I'm paying attention to what we are walking by, even if I've seen it 70 times before. There will be little differences.
A landscape friend and I were interested in what were called the Walk Streets, back in Venice. That neighborhood was changing with big houses coming in, so we photo'd the neighborhood over some weeks.. I won't go on and on, but it was very interesting...