I think you have to be a kook to NOT notice it. It's so blatant any more.
Without a doubt. In the spring of 2016 I spent all day fishing and boating on the Pacific Ocean. I had known of the “vapor trails” that are laid down in a pattern, but never saw them in this manner. The skies went from brilliant blue, to hazy gray in a few hours. The most insane part was the near 90 degree angles that were made by the flights, and the border it described. Every bit of overcast was man caused. When I moved about 25 miles inland from the Ocean, I also began noticing the drift of these long “clouds” from offshore to onshore. Crosses where “drawn” at the seeming same altitude, that air traffic controllers surely wouldn’t have passenger planes following. Like you said, you need to be purposely blind not to see it.