The nominal rates were much higher once, but the effective rates were never that high. Before the '86 tax reform, there were many "investments" available to wealthy people that entailed zero risk but yielded guaranteed tax benefits — we now rightly call these "tax shelters".
We should shed no tears that they are gone today, but we should also remember that the economic effects we saw previously were based on the effective tax rates (factoring in the sheltering activity), not the nominal rates. Now that these passive tax shelters are not available, the effective rates would be much closer to the nominal rates.
Also, as a tax-lawyer-turned-startup-founder, I can guarantee that if we saw rates like this again, the biggest beneficiaries would be the lawyers and accountants who would restructure contracts to avoid these taxes.