The most fun I ever had in the game was alliance roams. 15 to 20 of us on voice chat, coordinating engagements.
Also fun:
- Running training exercises for new players. We'd train them how to fly in formation, how to align ships, how to scan. The final training exercise for the corp was a "Snipe Hunt" where I was the snipe. They had to catch me, but if they managed, they were allowed to blow up my ship.
- Hauling for a mining gang. Fifteen people in mining barges and me in a large transport moving rocks back to our Player-Owned Station. Posting nonsense and memes in chat, while having the craziest discussions. Every once in a while, we'd get jumped by raiders and call in the cavalry.
At least three of the corps I was part of got flipped and shredded from the inside. Players worked to earn trust, become officers in the corp, gain security clearances, only to steal everything. They had fun, I guess.
But the time investment became way too heavy to keep playing once I became a father.