I know this is an easy downvote and foolish statement, but I find very few pre-90s blockbuster movies to be watchable. Spielberg's movies hold up well though. There are a few others, like When Harry Met Sally, that I also still love.
I agree (including When Harry Met Sally) if you include ~1935-1955 which was a of great experimentation. The films that held up well weren’t always the prize winners though.
Just watched Trading Places and it was still really fun.