Well it works both ways. Super slo mo cameras showed all of Shane Warne's variations for example. And pitch mapping and data mining can show you bowling trends. Does X bowler always bowl a slower ball after being hit for 6, for example. In the past you might have noticed a trend that he would bowl a slower one, but now you can plug in the laptop and print out real data, bowler X bowls a slower ball 87% of the time after a 6. You can analyse what lines and lengths bowlers bowl with certain fields, you can predict what ball of the over he likes to try a short one etc etc...so batsmen are better prepared too these days.