I think it's OK in moderation. My ds has 25 minutes a day of TV - he has one episode of Balamory a day - and he loves it. I don't worry b/c I don't think this is excessive, he really enjoys it, and like you said, it gives me a couple of minutes.
I am, however, quite strict with dp that the TV goes off when it doesn't 'need' to be on - I don't like it on in the background, b/c I think ds finds it distracting