A really useful tool that I use when learning a new class or spec is Doom_CooldownPulse. It will quickly flash your abilities across the middle of your screen when they’re off cooldown much like your WA will do, but it doesn’t require nearly as much setup or customization.
I would also recommend turning on cooldown timers as well at: Menu > Interface > ActionBars > Show Numbers for Cooldowns. This can help tremendously when you’re taking a quick glance at your action bars to see how much time is left on an ability. Instead of just seeing the grayed out button, it will tell you how many seconds remain until it is ready to go.
That being said, try your best to just take quick glances instead of focusing on your bars. I know this can be difficult when you’re still learning, but the more you play, the more muscle memory will take over as to where your abilities are on your bars which will really help in the goal of ungluing your eyeballs from that area of the screen.
One last note here, is that while something like this will be really useful when learning your class in a PvE environment, remember that addons like these are designed for PvE.
In PvP, you don’t always follow the DPS rotation because it can be so situational, and is more about out-playing the opponent rather than necessarily optimizing your dps rotation into them.
On your Pally for instance (and especially once you step into arena), you’ll also want to train your muscle memory to remember your utility and defensive cooldowns as well. Properly using abilities such as Blessing of Freedom, Sacrifice, Protection, Divine Shield, etc., are the difference between a win and a loss. Between your teammate surviving an assault or falling.
So while it is a great start to make sure you are nailing your priority rotation, it’s not all there is to it in that type of gameplay. You can get it down though!
Best of luck, I look forward to meeting you in the arena when you’re ready!