Just posting a number of laws does not explain how they are onerous or hard to follow. Let's see...

Minimum wage stuff, no hostile work environment, no unsafe work environment, FMLA doesn't even apply unless you have more than 50 workers, etc.

I know most of this stuff by heart just from being in the workforce, let alone an employer (who I'd assume worked for someone else at some point in their career).

"Onerous" essentially means "expensive to comply with", not necessarily "hard to follow". For more detail on these sorts of issues, see, e.g., http://esr.ibiblio.org/?p=1752.