Python 2 -> 3 change really was painful for Python community, but PHP does these almost fundamental breaking changes so often, that maybe people just get used to it? I haven't really followed Python past version 2, but I think they are less likely to ever do such amount of breaking changes.
There must be a lot of unmaintained PHP codebases that will break if PHP is updated by hosting provider etc. Someone must be pulling a lot of hairs because of this.
Edit: Those dogpiling there, I rest my case with josefresco's comment:
https://news.ycombinator.com/item?id=33907628
It's painful. Dropping dynamic properties? That will be a lot of fun. WordPress is probably biggest segment for PHP usage.
I have a private (non-internet) web-app that's still on PHP6.5; I like the new PHP features, but upgrading private code to conform to PHP 7 and 8 looks a lot like make-work. I wish it shipped with good upgrade tools.
[Edit] @darkwater (below) is correct; I meant PHP 5.6. PHP6 was some kind of abortion - I can't remember the story.