Many factors come into it, me being a boat owner and pass the walkway 3 times a week, you need to keep right regardless if any other boats around, sometimes you steer around floating wood etc but i cant see any boats getting closer than 50 yards at the walkway as they would need to stree back out to avoid the shallow rocks after the pilot jetty and the old wooden jetty for that matter.
Jet ski's are something else mind, not everyone but i have seen some bloody stupid stunts done by them..the best being some buzzing my boat so he could jump the wake then falling off not more than 15 yards right infront om me.
I have ran over someones line once and TBH it was impossible to miss it as people fish casting into the entrance of the marina...i spotted it and the crew guided it over the boat and away with out harm..if anyone cast at me on purpose i would be pulling up and having a word or ringing in a favour as i work hard for my boat and its the price of a good car not to have it damaged on purpose.
If in doubt point your rod tip down to the water and give out a shout to the boat drive, we cant always see the lines and may have just not seen you at all...as stated above we all fisherman no one wants to cause anyone to have a bad day or lose money on repairs etc
p.s any regular offenders then you can contact the port of Tyne with the name of the boat or jet ski colour etc.
Safe fishing