Haven't noticed better pumps, but have seen better progress since I switched to 3 days a week full body type workouts. As BigRo mentioned I also noticed that it's easier to stay leaner training this way.
Right now I'm training upper body 3 times a week (4-6 sets for chest, back shoulders and 3-4 sets for bis, tris and forearms) and legs 2-3 times a week
Once I burn out on this I am going to try a 3 day full body workout
I've never done it in my life (and I have been working out for 30+ years) but I'm curious about giving it a shot