It's definitely an entitlement issue for not just the current generation, but the current lay of the general public perception. I've seen well-grown adults act worse than five year olds with a flood light when it came to their phone, clicking away rabidly and flashing everything in sight. Seriously lady, put the smartphone down and enjoy the ride. I've also seen fifteen year olds with better manners than forty year old men, keeping hands to himself and being respectful and tasteful about what he did or said.
Social media tells us to 'share share share' with everyone, which is why people are learning to avoid it like the plague. I really don't want to know you had waffles to breakfast, just as I didn't want to know you had to visit the doctor to check in on your toe fungus. Gross.
That being said, to the OP. Photos in dark rides, big no-no WITH FLASH ON. People who do that, need to be hung upside down for an hour by their toenails. Flash off? Hey, have at it. You're the one who's hiding behind a screen all day and wasting your vacation. Me? I'm enjoying the ride, maybe I'll take a picture the second time WITHOUT FLASH so I don't disturb anyone.
We rode Ariel's ride in WDW this past May. Being an Ariel obsessed nut, I had to take some pictures. Want to know how many I looked at later? None. I missed the entire ride hiding behind a screen. Luckily for the live show later, I sat in the front row, filmed some segments of Under the Sea for me sister to see when I got home, but I recorded it without Flash, accepted it was going to suck, and made sure I wasn't upsetting anyone with the filming. I even apologized to the people around me a few times and they said they didn't even know I had a phone out. THAT'S how you're supposed to film/photo stuff; inconspicuously. If you're going to do it, be respectful and low-key about it.
As for people shoving into you or in front of you for a fireworks show, I believe that's what the good old, "Excuse me, I was here, you're not going to shove into me. Move along" comment works wonders if it bothers you that much. People recording things like Illuminations, Wishes, etc. will always have Flash on, and eh, it's to be expected. Doesn't mean you or I have to like it, but I'd rather them flash the bejeezus out of Wishes instead of POC or PPF.
I think you all need to tour with me. All 5 foot nothing of me can always seem to manage to get everyone around me to follow the rules. Mostly just to shut me up, but it seems to work. I start out nice, but if you don't comply I have an extremely sharp tongue and a wicked Irish temper. I really don't mean to get so belligerent, but once I get started, I can't seem to stop. I have gotten numerous rounds of applause from people around me though when I get some self-entitled jerk to stop doing what they are doing so I guess I'm not THAT bad.
I will let little kids in front of me at a parade though if the parent (or child) asks nicely, but if an adult tries to push though they will meet with an immovable wall, and a glare, and an "excuse you, I'm standing here, find another spot or get behind me".
Good gracious, can you go with us? I nearly bit my tongue off last time between foreigners and their kids shoving into me left and right, and people with their flash on in dark rides nearly had me screaming murder.