No worries Peter, I'm sure you won't be the first or the last to turn it off hehe. I only have the message showing because I don't use the Visual side at all and have therefore never switched (well years ago I may have but not for the last 2 years at least) so it hasn't been disabled yet. Guess I'll leave it enabled just for future need of posting the message lol.
I do agree with you on the warning though. It really does need to have something done to it so that people are fully aware that swapping is not recommended and in most cases that it will mess up your page. And it should be clear about that right off the bat rather than only when opening the full message.
I personally would love to see them remove the Visual tab all together if they don't plan to integrate them to be able to use both in some capacity or another. Since VSD is the main visual editor now there just doesn't seem to be a reason other than to cause a headache to those of us that have to keep posting warnings lol.
Good luck on your site, and if you truly are needing a visual editor, give the trial version of Visual Site Designer (VSD) a run and see if maybe that will do better for you. Although you can't swap from code to visual in there either, it does have tools for entering HTML code and Java and Flash etc. and is a pretty nice visual builder.