I loved how Sisko enjoyed finding out he intimidates Worf. What I'm curious about is how Sisko is able to intimidate Worf when Picard couldn't. Worf got in Picard's face in First Contact, but he does seem more... reserved around Sisko.
In general, I always thought it odd how subserviant to authority Worf was. In the beginning I think it was due to GR's rule against crew conflict and justified by his trying to be accepted. In the movies TPTB knew they had to toughen him up. As for Sisko? I would chalk it up to the difference in overall demeanor. A blind person could feel the difference between Picard and Sisko without any words being spoken or physical contact being made.