One thing that disrupts me more than it should is when a heavy footed person walks by my work area and shakes the floor.
Luckily I don't have much traffic by my current cube, but there is a guy in my cube neighborhood who walks very heavily. I think that the floor resonates from his steps and exaggerates the vibrations. I can feel the vibration in my chair and my monitor shakes a little.
My current situation is an improvement, my last location was along the main hallway in my building. There are plenty of people at my company whose steps I could feel.