"It's along the lines of putting your seat back on the plane....." Yep. I'm one of those people. If my seat reclines I recline it to my comfort level. That is why they have reclining seats. "Maybe we should have a Senior line." From the sounds and appearance of it that would be most of the people on this board and other Facebook sites.
Reclining doesn't bother me unless the person doing it then leans forward in conversation the entire trip. Why recline then.