Hawkeye used at Wimbledon

From the brief bits of Wimbledon I've caught so far, Hawkeye is in use on the show courts I think, but not on the outer courts. Use of the Hawkeye technology, that has been used so widely by the media in their cricket analysis, seems to be suggesting that more balls are "in" than was previously thought via the naked eye.

John McEnroe's view was interesting I thought. He thinks that the use of Hawkeye increases the accuracy of the calls by the line judges because they relax when they realise that they have technological back up if they make a mistake. I wonder if the same could be said of cricket umpires if technology was to be used for all decisions?