For me it would have to be that feeling of security and assurance you get in many aspects. We're by no means untouchable but there are a lot of convenience spells that can get us out of a spot of bother.
I thought about this post whilst I logged in outside Strat, I thought to myself "I get the health regen disease, who gives a fuck, I can cleanse it off with a flick of the mouse wheel", the ability to avoid being ganked and solo old content are other persuaders.
So What do you most enjoy about playing your Pink Knight?