You're right, it's not like polio. In 1952, the worst polio outbreak in US history caused 3,145 deaths and 21,269 cases of paralysis (of varying levels) (ref: https://en.wikipedia.org/wiki/History_of_polio#Epidemics). In the last roughly-year-and-a-half, COVID-19 has caused 716,370 reported deaths (ref: https://covid.cdc.gov/covid-data-tracker/#cases_casesper100k..., but it'll probably be higher by the time you check).
So COVID has been killing people at over 100x the rate of polio at its worst.
Also, polio didn't overload the capacity of the healthcare system the same way COVID keeps doing. This causes consequences for people without COVID who need access to healthcare.
>I had covid, it was like a really bad flu.
COVID has highly variable symptoms; taking your particular experience as typical is a mistake. In a lot of cases, COVID is asymptomatic. In another lot, it's roughly like yours. In a smaller, but still significant fraction, it's much more serious, involving hospitalization. (Also, something like half of symptomatic cases involve ongoing "long COVID" symptoms.) In an even smaller, but again still significant (see above) fraction, it's fatal.