When I was watching Hilfenhaus rap Strauss on the pads, first ball of the second innings, I started thinking again of the effect that Hawkeye has had on cricket and umpires especially.
Five years ago, there is no doubt that it would be given out LBW. Leaving the ball, hit well in front on or around the knee roll - thanks for coming. The benefit of the doubt would almost go to the bowler in that circumstance; you have a bat, use it! However, now, if that had've been given out, then people would decry it as a bad decision.
In a way, it evens itself out, as it's becoming an especially effective tool for spinners and LBW shouts. It has also, in general, made umpires a lot more aware of height when deciding upon LBW appeals. But it lets batsman get away with more when they don't use their stick, something that I don't agree with at all.