"I think they are dreaming if they think they are not under pressure. Every team is going to be under pressure, you've got to win pretty much every game.
"Our plan is to win every game. There will probably be a little more pressure on us being a home World Cup but we are prepared for that."
The 33-year-old was shaken by the death of former Australia teammate Phillip Hughes, struck by a short ball batting for South Australia in a Sheffield Shield match in November.
But Johnson is comfortable again with his aggressive approach.
"I'm a fast bowler who likes to bowl fast," he said. "It's probably changed a little since Phil. Everyone was a bit funny about it at first. But it's part of the game. I'm still going to bowl short balls that can set up a wicket for me. I think it is still important, a very big part of the game."
Meanwhile, Cricket Australia has confirmed Ryan Harris will miss the rest of the domestic season to ensure the 35-year-old seamer is fit for the Ashes series in England.
Harris, who will also miss his country's two-test series in the Caribbean in June, has a history of injury problems, but his Ashes record of 46 wickets over the past two series against England means that he is crucial to Australia's hopes of success.