I was unable to replicate my setup on another machine, so I always had e.g. my laptop "ugly", and my main machine pretty.
About two years ago, or so, I switched to i3. I have a single config file where I changed the color and the primary keybinds, and I adjusted the bar and the runner to be easier to use. It's two config files. I copy them around and all my systems look and behave the same.
They're ugly, and they get out of my way. I don't get to adjust anything, because more than 98% of the pixels on my screen are apps I'm running.
I don't see my desktop environment, I don't have to deal with it, it just works and I got used to it. I am incredibly productive on it when I want to be, and I can focus entirely on entertainment or writing when I want that.
Not a single animation outside of one's inside apps ever plays. If I open an app, it's the right one because I typed the name, and it opens instantly.
On windows, I type the name of an app, and right before I hit enter, the search changes and launches something else.
I haven't worried about GTK vs Qt themes even once since switching. I don't have window decorations. I just have my workspaces, my code, by browser, and I forget that I have a window manager.
I'm not going back for a while, and using KDE, Gnome, or even the Windows GUI, feels slow and clunky.