Less responsibility? Maybe. But you're more likely to have asshole bosses or customers, the work is far more repetitive, it's far more likely to be physically demanding (which may cause medical problems later in life), and lower wages mean less financial stability. There's also the issue that in most part time jobs, hours are not guaranteed (so you may have some months with far fewer hours than other months), and you may be asked to come in any time and be expected to do so or be fired.
Increasing the minimum wage helps with many of these issues (a lot of the reason why conditions are so terrible for minimum-wage workers is they have no power to fight unfair and unlawful treatment, but an increase in wages would give them a better chance to do that). But I can guarantee you that if you tried a minimum wage job for a few months, you'd want to go running back to the software job.
Also, you should probably look for a better employer. Good employers know that pushing employees to work 12-hour days leads to burnout and crap productivity, as well as high turnover rates. My employer (in software) actively urges me to make sure I don't spend too much time at work.