Goals are worth more. The reason playmakers are so important is because of the diversion/confusion it creates otherwise players would just shoot every time. But in the end, the puck usually gets to the person most likely to put it in. And for a reason - they're better at it. There's no science that applies to this, it's the most abstract question imaginable, but I say 1 goal = 2 assists.
But do they usually get the puck without the other person making some sort of an effort. There are people that aren't good scorers but excellent passers. If those people don't do the work do get those people the puck, that guy isn't going to score anywhere near as close.
Lets look at the players that assist in feeding the puck.
Puckhandlers- players like marner use thier hands and creativity to draw players to themselves creating open spaces for scorers. They don't just pass. it is a developed skill that not everyone has. Like you said they are important because of the diversion and confusion created. That is a skill and should be awarded no less than a goal.
Physcical players- Using your body to fight for the puck in order to get it to the person in scoring position. Or as a secondary assist. Someone like Hyman or Wilson using your body to get the puck to the primary assist getter in order to set someone up or take a shot on goal. Many times those secondary passes are more important. If that guy didn't go get the puck using his strength, then the goal wouldn't be scored.
Defensive puck movers- As I said in a previous post, moving the puck and getting it on the stick of someone in the defensive zone or outside of the defensive zone is harder to do as there is more risk. Generally nobody behind you. Most of the time those are secondary or even third assists.
These can be even more important than goal scorers, becasue without them there is NO scoring chance which would result in NO goal.
Hockey is a team game and although the scorer "finished" the play, that by no means means it was more important or easier than the other people assisting in the goal. Without that player assisting in the play, that goal most likely wouldn't have happened.
The only way we can look sating a goal is worth two assists is when it is unassisted or for the most part, every goal looked at individually and the whole play assisted. But we can't. There are many times when the assist should be worth more than the goal. I can argue that a percentage of goals maybe 10 percent, where the third assist isn't even awarded to a player but was the actual assist that created the play that led to the goal. Even many times a player can be more important to allowing the goal without even touching the puck.