Hi Schaplin,
Once your eyes know what to look for, you can spot them easily without even doing it on purposes.
That happens to me here as well, especially at this time of the year, as other trees are not completely leafed out or have been pruned.
I myself spotted two big ones in some backyards... Funny . Our brain lies to us and does not show us what we don't care for ...
That is why a man can spot some woman's forms quicker than anything else - and that is used on purposes at marketing level.
I read an article saying that without even doing it on purposes, we educate our brain with our hobbies, and it will spot, things he knows and recognizes, much more quicker ...