I suppose it's a lot like jay walking. Some people will care enough to observe the law and others will not. In reality, the problem only arises if you record something (say a lecture) and share it publicly and it exposes an individual whose identity is otherwise protected.

My experience has been, as someone that observes the law, I've been denied the opportunity to audio-record a lecture. In this instance, the person in question did not object but the professor did - stating that there was an individual that could be affected. Granted, it doesn't really make a difference if I use it for my own personal use but since everything is hosted in the cloud these days...