At the start of MOP I did a complete overhaul of my UI with the intention of clearing clutter and make me less prone to stand on shit and fail at mechanics. The end result was improving a lot my keybinds and moving my action bar away from the middle (i have it on the right bottom side) and only having a few key CDs aura closer to my central area. It has helped me tremendously.
Also, as a group, if we find our selves tunneling too much our RL sometimes will call a "learning exercise" where we don't dps boss and just do the mechanics. It also helps a lot to get a better sense of everything thats happening without having people worried about their damn dps