Side chaining the kick to the bass is very common. Guitars however, usually no. I will say however, from listening to more recent Colin Richardson mixes, the guitars themselves pump/compress by a fair margin on palm mutes and and duck down when they are not by themselves. It could be automation, however, to me it sounds more like the guitars are just ducking through the master bus. Regardless, it makes the guitars sound pissed of as hell and is a method I have been experimenting with.
In term of using vocals to side chain the guitars try it, but use a more master bus compression settings, med attack, slow release and use the threshold to control how much you want the guitars to attenuate when the vocals come in. The big trick is getting the release long enough so that the guitars volume reduction remains constant until the vocals stop, then you want them to slowly fade back up when the vocals stop. Do not use too much Gain Reduction, about 1.5db - 2 dB at the most. Any more than that will begin to offset your whole mix. The overall effect should be very very small and not noticeable to the listener.
I also prefer to use wide-band compression on guitars to tame the low end on palm mute rather than using a multi-band compressor just because ducking the guitars on every palm mute again makes them sound way more pissed off.