Great thread!!
I agree with several people in that it all has to do with the degree of the seat.
I never gave it too much thought, and automatically inclined every time I flew until on a flight to Vegas, the man in front of me reclined, and was literally in my lap, drunk and sound asleep. I was pinned to my chair the entire flight, there was no way I could get out. But that was a charter flight, and I have never seen such small close seats.
Now, I always turn around, check to see who is behind me before reclining. Now, I find I would rather go with a kink in my neck before terribly inconviencing the person behind me. If it just an inch or two, then I will do it, but if goes more than that, I don't.
In regards to the kids shrieking, I feel so bad for them, and their parents. You just know that their ears hurt and nothing is helping. But for the kids who walk their feet up the chair in front of them, or pound on their tray tables, that is a different matter. My kids tried to do that the first time they were on a plane, and we put an immediate stop to it, just by diverting their attention. It is obvious to me, that if this stuff goes on too long, then the parents are not paying attention, at which point, I make it obvious by turning around and looking at the child. I usually don't have to say a word, lol.