2 sets of steps always speeds things up, plus you can get the fuel pumping on too straight away - Ryanair love 2 sets of steps - when it works and everyone is doing their job on the turnaround then its all easy peasy -
A good traffic officer/dispatcher, the ramp guys and gate staff - a good well co-ordinated team can turn a 737 around in 25-30 minutes without stress plus a smile from Skipper and No.1...
Been there, done that, got the Uniform, gold buttons and 4 stripes lol - loved my job but was always amazed at the shear chaos that some of my colleagues manged to create...
PS
turned a DC-9 round at LHR T1 on B2 in 5 minutes with Capt Tony Belcher the BD339/340 MME - 90 pax in and 90 pax out plus 2 on the jump seats to make it out before the LHR jet ban at 22.59
still got the memo from Toad Hall thanking me and us all