aside from positioning and using the occasional cooldown, yeah, that's exactly what it is. There is no effort in trying to maintain threat, you just have agro, at all times, no effort required, there should be, that should be part of tanking, it's fucking boring without it.
And before you fucking start: Obviously when DBM yells at you isn't the only time you use active mitigation, you use it as much as is reasonable while keeping enough resource/charges available to always be able to use it when required by a mechanic.
It's still fucking boring without threat.