Flame away, but I always think of "miscellaneous" exercises like that are just nice diversions from a regular BB routine on occasion. You know, as a change of pace. In fact, I think there are way too many articles here on T-Nation that advocate such movements as if we'll reach our BBing goals by including them.
But if the shortest distance between 2 points is a straight line, why would I want to waste so much more energy by zig-zagging? In other words, for example, if shrugs work so directly on traps, why lumber around until I'm exhausted doing Farmers Walk in the hopes that it'll bring up my traps? Hey! Maybe I'll get my training partner to hold my feet while I walk around on my hands doing the Wheelbarrow for a few laps around the gym parking lot! My pecs are sure to swell up from it!