I'm surprised to hear that Easyjet have changed existing booking times without notifying anyone, as they are sheduled flights. Are you sure that the flights now showing aren't additional flights? I thought only charter flights were liable to change.
Personally, I prefer to travel out later then have the additional time on the last day, but can never get anything other than 0600hrs flights out, which I hate as I then feel half-dead all day. Then I get an early flight home too, and lose the last day there. My personal preference is to fly out between 1100hrs and 1530hrs, returning after 1500hrs.