Barry Lyndon.
Don’t get me wrong, I don’t hate it at all, but I definitely think it is much less good than when I first saw it. Like Duracell with Gump, my first viewings were rose-tinted by my now long-gone love for the 18th century, and so I thought it was the best movie ever made. There I smeared that sentimentality all over TheTopTens (the site I was on during my long absence here back in mid-to-late '19).
In conclusion, Barry Lyndon doesn’t hold up today compared to when I first saw it.
Or for the short answer, Barry Lyndon is still a very good film, but it isn’t “the most beautiful film ever made”.
P.S. Speaking of Gump, TheTopTens bot-voters disagree with you.(https://www.thetoptens.com/best-movies/)