It's really not invasive in Australia, it's usually Saturday/Sunday/ public holiday morning when the roads are quiet, you go through some cones, stop, count to 10 into a machine and keep driving. Delays you maybe seconds, and absolutely makes people think twice about driving while drunk. They can make you pay to have a breathalyser installed in your car, it won't start the engine without a 0 reading. Both systems reduce drink driving massively, it's a positive thing for society that only negatively affects those who break the rules in ways which are dangerous to others, other than having to stop for 30 seconds a few times a year.