Indeed. I'd go as far as to say you probably shouldn't believe most things that are written in most pilots.
... but incidents would be very few and far between I'd have thought: the occasional cruiser sending a grib request and such. 
I suppose now the long range course has reduced from the 18 months that it originally took ships radio officers to a week or so there are many things which might get glossed over. It is possible that marinas might turn a blind eye but you will find that in general no ships use SSB MF or HF while in port anywhere in the world. I don t think this rule qpplies to VHF so long as it is used in regards to navigation. However I expect some ports might not endorse BarBQ invitations going out on the port control frequency or ship to ship frequencies
There is usually reference to these restrictions in the port hand books. Why not get hold of your local port handbook and see what else you are unaware of. They say the reasons are to do with interference however state security may also be a concern. The port limits usually apply so this can mean quite an area of sea is included. One area of interest for Live aboards will be areas such as the Gulf of Suez where Egypt has certain restrictions.
Beware the Pilot books may not be wrong!!!
Mind you our puny 100watts might no get noticed as much as the 1.5kw from a ships radio. It used to amuse me that the output valves in my transceiver were the same valves as in the EXCITER stage of a ship's transmitter supplying the main transmitter valves.
Your mentioning valves brought a faraway look to my face and tears to my eyes, though that was because I'd drifted off and spilled hot coffee in my lap. I well remember my apprenticeship with Post Office Telephones back in the....well a very long time ago. We used to reckon that with valves if you looked carefully you could even see the electrons moving. Those were the days.