I actually do, yes.

All of my machines at home and online are all Linux machines, one of. Some of them have graphical UIs for various reasons. With that, all I need do is include the -X forward in my ssh config, and I can run X apps and display locally.

Right now, I have 3 programs running on remote machines. I don't have to care where they are... because they're right here on my desktop. It just works.

And Wayland/Mir/whatever doesn't. That's trading security problems for a purely worse experience.