I boarded Celebrity Eclipse in June 2023 with 3 medium sized ships in port. We arrived at Canada Place at 11:30 joined a large but reasonable fast moving queue to drop off luggage, then upstairs for cruise line specific checkin with minimal queue, joined a fast moving queue to get back downstairs for security and then passport control. This was the slowest part but even then it wasn't too bad. After passport control we immediately boarded the ship with no further wait.
It is a bit muddled with crossing of various queues but time wise it wasn't too bad.