When it comes to my UIs, I like a minimal feel without being completely minimalist if that makes any sense? I've been playing with my UIs since Vanilla back when Discord Unitframes were the shit (still probably better than ones now a days, but was a huge memory hog). I'm also a little traditional in how I make my UIs as well.
I like my horizontal cast bar. I like my simple rectangular health frames and raid frames. I make my UI to be clean, highly functional, as unobtrusive as possible, and overall show as much information as possible without screwing it all up. This is my UI:
Now some may look at that and say "lol elv ui" or some shit because it has some similar things. However, every single addon was downloaded with their default settings and I changed every single thing to my liking. I'm not saying this to get attention, I just hate when people assume it's made from something else because it kinda sorta looks similar.
I used to be big in the UI game during TBC and wrath. I eventually found a UI over years of tweaking that I like and I use it. It might not be "innovative" or "flashy" but it works, and I organized and customized it to my liking.