Are healadins viable?

Hi all Rolled healadin for retail up till cata and briefly played healadin for classic up till molten core.

Thinking about rejoining the game for 20 anni realms and could use some advise.

0.Are there addons available? 1. How’s the player base ? Is it too late to join now ? Are there lots of servers for all regions? 2. Are healadins viable in end game? 3 any other tips?

Thanks so much!