@michaeljb, what?
Chancellor may not be a great card but it's for sure an accelerator rather than a slow card. The benefit is rather immeidate (your next hand). you are cycling things in quicker rather than slower. Not a slow card at all.
Ambassador (you are trashing in a slow way and attacking)/duke (you need a bunch of duchies before it's worthwhile, definitely leads to longer games)/goons (attack, care less about province/cursers in general (delayed benefit).
I don't think of treasury as that slow a card, in particular it's an early game accelerant, which, in general, make the game quicker not shorter. Sure it discourages greening for a bit but it's a quicker card than, say, market.