There are a lot of mooring balls (and boats) in the river but almost no guest balls. The mooring fields occupy the best anchorages. It is hard to find a spot as the few guest facilities are almost always full. Finding a place to land a dinghy is also difficult. The fields are not well marked. Traveling down the river at night I had to keep a very sharp lookout to prevent Reboot from hitting moored boats with dim anchor lights.
Then of course there are the Citi-Cats. These ferries run at high speed and wake every anchored boat as they pass. And sometimes they pass 30 feet from the boat. Not pleasant.
All said I enjoyed Brisbane a lot. I wish they made it more boating visitor friendly.
Fair winds and following seas :)