I can see both points of views and I first questioned the wisdom of the change as you are now. However I can see some advantages of the new procedures that perhaps out weigh the the extra time it takes to complete.
I suppose if you have made the decision to evacuate the aircraft, you are obviously under a lot of stress with your levels of adrenalin and whatever other hormones you have being pumped into your system at an all-time high. No doubt the chances of missing a checklist item are fairly high.
Perhaps it's a checklist that should not assume that both pilots are not incapacitated. If there is only one of you able bodied, obviously running through a single checklist would be far better than two separate (yet simultaneous) checklists.
The fact that the checklist is printed on the back page of the QRH means it's pretty easy to access and run through.
So for those reasons I think it has been a good change.