I'm an early childhood teacher as well and I cringe at the thought of people watching me all day. I hae nothing to hide, but to think I was under scrutiny all day at work would be too much pressure. I owuld feel really self concious (sp?) as well.
Also, there are some people who think they're children are angels and could in no way do anything wrong and seeing me reprimand their child for things would be too much. I just think it would be creating conflict between families and carers at times.