lightbrite,
I have seen people do what lesschumras said about pushing for food and even complaining about it unfortunately.
I have seen accidental pushing, with “oh, sorry, excuse me!” thrown in, but that is a normal pitfall of a large crowd trying to access a small space.
I have seen people grab an entire plate of food off the table, but it’s usually to move it closer to their plates so they can serve themselves without spilling stuff all over the table. If I ask for the plate back politely I’m usually obliged politely.
I have seen people standing at the communal tables and eating, but they are typically unaware that they are blocking others, and a quick “good Shabbos” or “excuse me” will get them to move.
and there were several otherwise normal yet ravenous individuals in the group.
I bet the davening ends fairly late at your shul.