Nearby players or your companion should be able to use a rope to help you get out of crevices. I recently had "50' rope" in my inventory when I got trapped between rocks that were just tall enough I couldn't short-range teleport out of. Near as I can tell, that particular rope had no in-game use except to be sold to a merchant.
Why not make rope a tool, instead of just worth a few coins? A player could signal "Throw me a rope!", and your companion or a nearby NPC would throw a line down and hold it while you climb out. Or "Pull me up!", if the stuck player is the one with the rope.
I got in that hole by using short-range teleport to jump backwards away from death, but I've been trapped a lot of times. Through lots of different circumstances. With my companion hopping in and out of the trap with ease, while happy to leave me in there for all eternity.
::What did I ever do to YOU, dear companion? …O, that's right: used you as a reusable meat shield which auto-resurrects a few seconds after dying.::
Currently, characters can easily get into spots they can't climb out of, and may have to switch instances (if one is available) or /defeat themselves. This seems unnecessarily punishing. I, for one, would heartily welcome our new coil-bearing saviors.