Any of the unit frame addons should get you the option of Party Member's Targets and Party Cast Bars.
That lets you know what the slaves are targeting.
And that they are casting.

Dungeon Finder is relatively new.
If your group has a class which could spec as a tank, a different toon whose class could spec as a healer, and three other toons, you can queue for level appropriate dungeons as a group.
If you have less then five toons, you can still queue and get a random person/people to join you.
So dungeons are a leveling tool now.

Battlegrounds get you experience, based on objectives completed and winning.
The weekend battleground, is probably the place to be, if you want a change of pace.
You can level entirely in BG's, if you want, although your factions win percentage might make this a good or poor choice.

Not sure if you know about Click to Move and Interact With Target.
The first is under mouse options.
The second is a warcraft keybind.
The combination opens up melee teams, or at least makes them much easier to play or add a melee toon to a mixed team.