... like Vertigo (trip) and stun effects.

Nothing like knocking multiple melee mobs senseless on your way past them for a few seconds so the rogue can do 1.5x sneak attack damage on stuff while you move on to the casters.

Re the argument against cursespewing/destruction - often there is indeed no need for anything that lower's the mob's AC, but those effects applied by anyone helps everyone hit the mob far more often than without - especially those classes that don't get full BaB (my main's past lives with rogue levels always had issues hitting Malicia in epics without at least one of improved curse or destruction, with some reasonably decent gear, so would regularly switch the GS for destruction effects to help the DPS out). However, with the latest combat changes, the difference may not be so great...