The setting doesn't work. even if you turn it off you still take damage
I guess fixing it would help, however I still think it'd be destructive to have massive props flying at you at mach 10 speed even if you won't take damage from them. They can get you stuck and would mess up gun fights.
I don't know what server setting is responsible for it, but if heavy/big props were sluggish to move and tiny props could still be moved quickly (though not as much as they are today where one button can launch you half way across a map) than that'd be great