Earlier quoted context omitted.
Here in Sweden I go to the tax office website, log in, have a brief look at that all my salary has been correctly entered (I have yet to encounter that it hasn't) add if I possibly want to deduct some extra things (also very uncomplicated), go to file and click send (the whole thing can even be done on mobile) . The process typically takes 20min max, Australia was quite similar. I'm always amazed by tax systems which…
If your taxes are easy in Sweden / Australia they would be easy in the US.
HMRC's website in the UK is far from perfect, but its tax form covering all UK personal taxes has the features people appear to be paying for with TurboTax (Q&A format, most sections being optional, references to industry specific deductions, guidance notes) baked in.
If your taxes are "easy" in the UK they come out of your payroll without you filing a return.