Right now I'm at Fiumicino airport, next to Rome. Last time I was here it was quite a process! This time, I'm only transferring from one flight to another in the same terminal ... which means I only had to take a short train ride. Twice. And a security check (and throwing out a full bottle of iced tea I bought at the terminal at Logan). Then, a 90 minute wait followed by 40 minutes standing in line to board after they called boarding, followed by 90 minutes sitting on the plane at the gate, until they told us they need to find another plan and sent us all back into the terminal.
Edit: After I posted this, it turned out our second boarding was via an almost 10 minute bus ride from the gate to the plane.