Coalescence is both a healer and tanks best friend <3

And yea, trying at least 1 class in all each category definitely helps everyone gain a bit more perspective. Even as a DPS, I've learned some things I took for granted while being a tank. But it also makes you more aware of when other's are doing cringe worthy things...

And technically, Paladin forces you to do both healing and tanking :P But you could easily get to lvl 15 without ever really hitting the harder content with a healer ^^'