I wouldn't say you are hugely wrong there. My father had polio (and was on an iron lung for a bit) and is perfectly healthy now. As were everyone else in his family who got it (everyone else in his family) other than an uncle who was a brittle diabetic and had problems already. no other classmates had lasting problems either. I've only met one person irl who had lasting problems (post-polio syndrome).
I know two people. My 75 year old aunt had polio and as a result has a slightly paralyzed mouth, she has no other health effects from the Polio. The other was a girl at school who was probably three or four years older than me, she wore a leg brace.