I trip out when i see people with hangers that are just evenly ground down along the whole thing. All of the times i've gotten to axle it's in my back heel corner where i do front 5-0s on pool coping. what grinds are you doing where you consistently use the whole hanger like that?
The wear pattern is an interesting one. I keep meaning to take some pics of different trucks from people I know, but the best examples as follows:
Transition only skaters - usually not a lot of wear all over, mainly back heel point from grinds
Curb slappy fifties only - usually flat wear the whole width of the truck, often front more so than back right across with back more in the middle, but not always
Curb / noseslide / crooks only - usually more interesting wear across the front / back truck faces from the angle of crooks and significant baseplate wear, sometimes through to the pivot cup area.
The fact that some guys will skate a curb one session, then hit the park and skate pool coping or other stuff, or even those more all rounders make for more even wear but any rougher edges, be it ledge, coping, raw whatever, you are going to take off a lot more metal each session than those who skate just a plain smooth metal coping / edged skatepark or similar surfaces.
Edit:
You can easily tell what I usually skated a lot more, from these three old boards I took pics of from a while back (last pics in particular) which are all down to axle and then retired, one more than the others, but nothing like some of the awesome trucks I have seen here. I also went up board and truck size, so these have been hanging around more so waiting for a new home than anything else: