Not yet Cawdor, I have done something about what made my trading days enjoyable.
It was interaction with house authorities when I got hailed, stopped and scanned. The BAF even escorted me all the way to Tau-23 from Leeds. The other thing what makes it fun and thrilling is possibility of getting pirated.
Simply I only have fun trading when I interact with other players. When I check the chat window and see there is no one in the systems ahead of me, I don't feel like carrying on on that route. I hate finishing a trade run and realizing I haven't spoken to anyone while crossing 6 systems. One of the solutions is to have more trading ships and switch to other character wherever is a possibility of some PvP interaction (not necessarily a combat situation).
But other factor which I believe is true that Sirius is just too big for 200 players. There are over 120 systems in Sirius. That decreases the chances of meeting other players and makes traveling through empty space so boring. I know many may disagree with me on this however I believe I would have more fun if Sirius wasn't so big.