Google "free tax file". It's the top hit. I think it's also on your W2's your employer gives you. I'm not sure if it could be made easier, but open to suggestions.
Used to be hidden and had disclaimers that it couldn't be used if income was over 50k or something ridiculous, making it unusable in CA.
It's still about 1000x more complicated than filing in New Zealand, which is comparable to filing on the California site. Basically a 15 minute wizard on a web page.
Sure, it's not fun, but it's not an overwhelming burden for those with a simple 1040.