That's interesting.
I find it's the shoulders that take me a disproportionate amount of time. Once they're out of the way (I do them first) the rest doesn't seem so bad.
But I agree, there's a lot of work in the haunches. Particularly if you're trying to get a whole range of different cuts out of them (each haunch will do some medallions, a few rump steaks, a roasting joint, some best dice, some stir-fry strips, some mince and a shank).