This is an interesting thread! Here is my 2 cents (or pennies as I'm Scottish).
My flight to Fl lasts around 8.5 hours. By the time I'm on board, I will have already waited 90 minutes at my local airport to be flown from Scotland to London - another 80 minutes, and then had another 2.5 hour wait for the USA flight. So before I even start, I'm not at my best

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I have some infrared sensor, I think on my forehead, which prompts every person who has ever sat in front of me to recline their seat for the entire 8.5hours! This can be the only explanation for this curse which haunts me.
In truth, it only annoys be at mealtimes and at restroom breaks. I will usually gesture to the cabin crew member as I'm being served food that I do not have space to eat. They always have a quiet word with the offending person.
Now at restroom breaks, it's a case of doing some nifty La Nouba style moves to vacate my chair. Somehow, that chair in front always seems to be in the way, and it always gets a hard thump as I go past. No idea how that happens

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I don't find reclining my chair any more comfortable. I will very occasionally do it on my flight home as it's an overnighter and EVERYONE reclines then. I always have a quick peep at the person behind me to see what they are doing but so far, they have always had theirs reclined too. Then I don't feel bad about doing mine as well.
Whoever thought I could ramble on so much about a reclining seat?
