Ok, I'll bite - curious why you feel its dangerous for more than one vessel to go through that area?
No biting required .That was a good question.
When a cruise ship, or two is exiting through the First Narrows and the Granville Island rental crowd is trying to go under the Lion's Gate eastbound I have observed higher than normal levels of nautical stupidity adding a Cruise Ship or bulk carrier to the mix just turns the dial up to 11.
Cruise Ship exiting or entering and boats captained by folks who are experienced not a big problem .
I chose to wait and while waiting I see lots of really dumb things happening. Harbour Patrol is trying to control and manage things as best they can but that is not always enough.
The issue is not about folks who know what they are doing and give way and tuck in along the Stanley Park seawall but rather the rental Captains who are perhaps operating a powerboat for the first time . Plus the impaired and the speeders, and the folks who really should know better..
On occasion I have seen the Harbour Police hold boaters back by asking them nicely to wait. .Folks still ignore them.
I wait because I am not in that much of a hurry, and I don't want my family to be adversely affected by someone else's actions when waiting 5 minutes is so easy.
I also don't want to have to be pulling folks out of the water and doing CPR . I have done it (CPR) 5 times and so far have had zero success .It tends to wear on a person.
In the end, It is what it is.