You're right, it's rampant and in some markets it's hard to find an opportunity to work for a company while avoiding this kind of attitude. Shame. I've thought a lot about turning to contracting to 'solve' this problem. I'd rather have a dispassionate agreement based on what I think an hour of my time is worth than a personal one about how much of my available time I'm giving to an employer incapable or uninterested in evaluating my work product.
Fortunately, at present I'm on a ridiculously amazing team at an awesome startup and this isn't a problem I'm currently faced with.. but I've seen quite a bit of it in the past, and I expect to come across more in the future.