A new disease with unpredictable long-term effects, that kills at least twice as many people as the flu despite unprecedented preventive measures is bound to cause more alarm.
Remember that regions hit early and unprepared were carting dead people by the truck load, most notably in Northern Italy. If we didn't have lockdowns and other measures, that would have continued and escalated all over the world - we would have probably easily had 10 million or more dead just this year if we had treated this just like a flu.
Over what timeframe? Novel viruses come but once per century, flu kills consistently year after year after year, always mutating to escape eradication... and the flu deaths pile up to astronomical heights over the decades
Only a relatively small percentage of Americans have gotten infected with SARS-CoV-2 yet. Without vaccination, in the space of a few years at most, CoVID-19 will kill as many people as flu does in many decades.
Masks are something we will hopefully have learned to wear forever during the cold season, as they will have a measurable impact on deaths not just from seasonal Covid, but from seasonal flu as well. I believe that the majority of the population will internalize this simple hygienic practice from now on, which would be one silver lining for this pandemic. People in East Asia have learned this habit some time ago, and it has served them well.