Most drunks are not. Most drunks are also not aware that they can refuse to take the field sobriety tests. Most drunks are also not aware that they should never, ever admit to having had anything to drink. (Once you admit to having even one drink, the cop has probable cause to arrest.)
In New Jersey it is not a good move. If you refuse to submit to a breath test, you will not avoid penalties. Instead, New Jersey law has separate penalties for Breathalyzer refusal. If you are a first-time offender, you could face: License suspension of seven months to a year.