We've perfected our technique over the years so we have it to an exact science. Let's use... Doctor Strange, as that was the last film that we all saw together. We saw the 7pm screening on opening day.
We established beforehand that we were all to meet at a convenient meeting location at a hard deadline of 5pm. People who have cars and are willing to drive volunteer as carpool agents, which they have a Slack for for communicating. Some of us purchase tickets through those organizing the car pool, so we need to deal with that. Many, of course, do not.
We each show up at the meeting location (all at different times before and after 5) and group up and get shuttled to the movie theater. Those who need to buy their tickets do so and those who already got their tickets start forming a line. Everyone already knows who they want to sit next to because we've been doing this for years. We buy concessions and hang out on line before the movie starts, while we shuttle those who are late in. Then when the doors open, we get seats in the back and if we're missing people we just put our jackets on the seats next to us. Considering the size of our group, anyone who shows up as early as we do would naturally not want to sit next to us, but if they ask for the seat, it's all theirs of course. We get the last few stragglers and then we enjoy the movie at our leisure.
...then we all pool out and talk about the movie (I often get bombarded with questions because I'm by far the most cynical and outspoken about my opinions of the group) and then we all go to the same eating joint to talk about the movie for a few hours.
Oh and we always take a picture! Not everyone can make the picture unfortunately, some have to bolt immediately and some are in the bathroom when we take it (hard to keep track of everyone) but here are a few pictures of all of us for a few movies!
I won't even pretend that we're a usual case, because we're far from it.
But reserved seating personally negatively impacts me, so I rail against it. If it's cool for you, it's cool, but it makes movie magic moments like these few instances impossible.