Well, I've been too pre-occupied with work lately to have much time to play with the editor *sigh* but from using the Pharaoh editor I can say this about triggered events.
They can be extremely cool!
I don't know what's allowable in the Zeus editor but in Pharaoh say if you had another city request a good from you and you didn't comply, then a triggered event could be an invasion from that city. I remember in playing one of the Pharaoh Olympic maps there was an event like that. Someone requested something that I didn't have and later they attacked. I tell you, that was surprising, LOL. But it added a fun twist to the game.