I haven't used work visas anywhere. I'm not going to the country for the purpose of work. I'm there as a tourist and do work while I'm there. Not typically engaging in any business transactions within the country.
If I tell that story at the US border there is a good chance I have to turn around if I may believe reality tv and comments here which is why I go to the US strictly for vacation (usually not even taking a laptop). Is that just paranoia or?