Valve has the power to convert violence into heat. Mining the data of 6.5 million shots fired so far in the CS:GO version of de_train, Valve's output is a heat map that's filterable based on team and two weapon types.
"Heat maps can reveal player preferences, choke-points in maps, sight-lines for snipers, and much more," Valve says. My takeaways: assault rifles account for 47 percent of shots fired; CTs fire a little more than Terrorists; the top-right lane shows near-perfect symmetry for sniper rifle kills; the most trigger-pulling happens in the left-side access hallways, probably from frantically finding an enemy after turning a corner.
Have a look here.