I have a reasonably simple personal economy and it takes me all of five minutes to file my taxes in Sweden. My parents have a much more complicated setup (small private business, own a couple of properties, several deductions, etc.) and it basically is pretty straight-forward for them as well, certainly they don't need an accountant.
TurboTax, Intuit and anti-tax Republicans has really fucked with the US expectation of how complicated taxes needs to be.