Im not an authority on this - I was a TE - but I am a pats fan...
The pats like Wilfork because he can control double team blocks and basically set the line of scrimmage. Hes an immovable object. They drafted DEasley cuz he basically did that at Florida. I watched some game film on him and he was blowing up offensive lines and "Commanding" offenses to double team him.
I remember an interview with Wilfork an the interviewer asked why their last opponent had left him unblocked as the 'read' defender. He chuckled and whatever his answer was, was to the effect that he proved it to be silly.
All I know is some guys are NTs because they can still thrive and have an impact against 2 blockers.
EDIT: This thread rules BTW.