At least crusher and advanced blast furnace damages the player on contact on only on some blocks, so far on the edge of the bottom blocks.
Blast furnace
Crusher
Versions & Modlist
ImmersiveEngineering-1.18-5.0.2-pre.348
MalkContent commented
seems to be suffication damage from standing in the "opaque full blocks" that the model replaces.
here's me dieing to a corner of the arc furnace: