And then we see threads about ATC loving the sound of their own voice. 'For sequencing' should cover it. As an ATC, I want you out of my sector in the shortest posible time. As has ben covered above, one ATC will need to stick you in a gap or create a gap, the next guy the same. These gaps are usually different.
Add to the LHR comments above, runway design. Appropriate high speed taxiways and airlines/aircraft that met minimum Runway Occupancy criteria.
Seriously, you guy DO realise there are other planes up there right?