The kindy classes at the school up the street show 30 minutes of TV every day! My neighbors (who are pretty crunchy) were so angry, and it was presented in a very dishonest way-- first it was just b/c they wanted the teacher to do one on one evals of kids after school started, when they had a relationship with her... then it was going to be during evals throughout the year... but it ended up being all year long. This is a major reason we're not going to be using that school when DD is of age. Oh, and the TV they show is just random stuff like a PBS kids show, nothing educationally tied to the curriculum.
I teach high school, and certain schools have really hammered us NOT to show films unless they're directly tied to curriculum. I certainly show the film versions of the books we read, to sort of buy time as the kids are finishing revising essays for homework (I don't like to start a new unit while they're still sweating their essays). Plus it brings the books to life, we can cover the compare/contrast genres standards, etc. And it's one movie for 14 year olds every couple months. I do show Romeo and Juliet 20 minutes or so at a time, every day, but Shakespeare was meant to be performed/watched, not read.

I think it's bound to happen that elementary kids will see short bits of TV and movies every once in a while, and no notice will be given, but there definitely are excessive uses of TV going on in schools, too.