Technically the delayed off-side isn't a rule change, but more of a reverting back to the old rule. But that one is a must. Keeps the play going. I think you'd be hard-pressed to find a hockey fan that is against removing the 2-line pass. I remember refereeing and calling that tons.
One thing I dislike is the goalie playing the puck in that zone behind the net rule. I think it's a bit school-yardish. I miss the odd goal here and there when a goalie used to get stuck in no-man's land in the corner behind his net. I'd like to see that rule revoked, personally.