COOL!!!
I'm glad it's not only me.
When I had my boat in Chichester I often used to go anchor off East head and go windsurfing.
Certainly a pain in the Ar5e rigging up on board!! I had to rig on the bow (the windiest part at anchor) but I got used to it. Had some fantastic days out there, and the girlfriend at the time didn't complain because she could sit inside in the heat and watch TV.
Unfortunately I wasn't able to do that very cool bathing platform start as my davits were in the way. I had to make do with jumping off the bow, often a very spectacular Bomb followed buy a few words of french as the water got in the neck of my wetsuit.