This is my own UI that I designed and iterated on over time. It's completely usable with all classes, as well as in all forms of PvE. If you'd like a better look at it, feel free to visit my channel over on Youtube.
How to install:
Move your Interface and WTF folders to another place on your computer.
Paste all 3 of my folders into your main WoW folder.
Edit the account, server, and character name to suit your needs.
Copy over your macro and bindings files for your account and each character.
Note: This is the first time I've ever looked into sharing my UI, so some of the files I included may be unnecessary and can be overridden with your own. The profile lists for every addon are also very cluttered.
Right-click the bar at the top of the screen. Go to Manage under Profiles -> Ysera -> KerÔ -> Load.
Type /bt. Go to Profiles -> Copy From -> KerÔ - Ysera.
Type /classtimer. Go to Profiles -> Copy From -> KerÔ - Ysera.
I use the default raid frames, so do what you wish with them.
If you prefer to use Recount, it may be hidden and/or disabled. Typing /recount show will show it. You can then go to Interface -> AddOns -> Recount -> Profile -> Copy From -> KerÔ - Ysera.
For Omen with Skada, right-click on the title bar of Omen and then go to Profiles -> Copy From -> Cannelle - Ysera.
For Omen with Recount, right-click on the title bar of Omen and then go to Profiles -> Copy From -> KerÔ - Ysera.