Part of it is that their position is most diffcult to perform well at... when they haven't played for so long. The 'rink rust' may be toughest to shake for Goalies.
They've been used to having 8 shots a period since their defensemen used to be able to "bottle up" opposing players, run picks, push them to the boards and hold them there etc. Having players actually get around their defensemen now and so easily must be kind of startling!
I'm sure part of it is they see a defender move in toward an opposing forward and they relax a bit thinking 'He's got it covered, who else could be a threat?" Now, just as that instinct kicks in and they have crossed them out mentally as a possible threat? That player blows around the defender and ends up having a scoring opportunity. Another thought; goalies are a different breed of human.
It's a different mentality and confidence plays a huge part in their play. So there is that psychological aspect of it... they've made their pads smaller, changed the entire game to make them less effective... it's got to be mesing with their heads.That's all just guessing/observation but here is a comment that I do know is a factor. I believe it was Glen Healey, former netminder now working with TSN that mentioned it last night between periods. The new rink dimensions are a goalies worst nightmare.
Due to there being four feet less space behind the net this year as well as the blue line also being pushed back four feet their angles are off. They visually position themselves in their nets by instict at this point basically but that 'sense' is based upon the rink markings. "Okay, he's at the top of the circles, he's at blue line, he's at the faceoff dot, etc.
You may take for granted how many lines there are out there yourself just as a viewer. Next time you look at a rink focus on how many lines and markings are in the attacking zones. They are all in different places now so the angles goalies naturally respond to based upon years of expereince and practice are also off.
It's just enough so that we see a lot of pucks bouncing off goalies and in... Add all the other factors in and it's going to be a lonnnnnng year for goaltenders. Defensememen and goaltenders will adjust to a lot of that as the season goes on but I think it's safe to say that the 2.xx GAA numbers are a thing of the past.
What do you think?
But the 1.8x or 1.9x GAA have totally disappear...and i think it's a pretty good thing,as it means more goals! 
(however,i'm a big fan of goalies,but first of all i'm a hockey fan!)
And what will this year's playoffs look like?