I leveled my DRK yesterday evening and already managed to get from 30-35, so it really is quick. And not even as boring as I thought it would be, because you can experience the job in dungeons and stuff. I really like the feel and the look of the DRK. The moves are way more aesthetic than the WAR, who always was quite "hack & slay"

So, thanks for the input everyone. Seems like it's worth spending the little amount of time to be able to do Heavensward with the class that fits me better.