In addition to that, RSUs are taxed at around 50% before you receive them and another 20% of the value it gained from when you received it to when you sold it. So the numbers in your bank account look less impressive than the ones on paper.
Yes, but to be fair to RSUs, this is no worse than having some additional ordinary income.
The 50% on receipt number comes from your marginal federal tax bracket plus state -- same as if the dollar value were additional gross (pre-tax) income.
The 20% on growth number (potentially 25-30% including state) is what you'd pay on capital gains -- same as if you'd taken this extra income as cash and invested it in anything.