Is the Brunelleschi Pass skip the line?

Yes, but only partly. The Brunelleschi Pass kills the worst line at Florence Duomo: the same-day queue to buy a Dome ticket. Pass holders skip that one because they already have a fixed time-slot booked at checkout. Two queues stay. Security at the Dome entrance still has to be cleared. The cathedral interior runs its own free queue at the main door, and the pass has nothing to do with it. The pass skips a queue. It does not jump every queue.

Only the Dome runs on a clock. Buyers pick a date and a half-hour entry window when they pay. Arrival has to fall inside it. A few minutes late is fine. After that the slot is gone and a new ticket is needed. The Bell Tower, Baptistery, Museum, and Crypt have no slot inside the three-day validity. The climb is 463 steps, no lift, narrow shells either side of the staircase, and roughly 45 to 60 minutes from the bottom of the queue back down to the ground. First slot of the day or last slot of the afternoon: those are the coolest, which counts in an unventilated stairwell.

Two queues survive even with a Brunelleschi Pass in hand. The first is security at the Dome entrance. It runs alongside the timed-slot system, not before it. Pass holders should turn up 10 to 15 minutes ahead of their slot to clear bag scanning without slipping out of the booking window. The second is the cathedral itself. Cathedral entry is free. First-come basis, Mondays to Saturdays from 10:15 to 15:45, Sundays closed for visits. Nothing on the pass moves a holder up that line. There is one workaround. Pass holders can use the side entrance through the Santa Reparata Crypt, which leads up into the cathedral interior and avoids the main free-entry queue.