The old intersecting Runway 18L/36R closed back in 2005 and is now part taxiway and mainly redundant concrete and a plant storage area.
Madrid might have 4 strips however the reality is only 3 can simultaneously and safely be used .
Departures off 32R are rare, avoided as they conflict with 36L.
Similar to Amsterdam the operational preferences are a single departure and 2 arrival strips with staggered spacings.
However none of that really relevant to a Gatwick thread !
The ATC also has to deal with the risk from conflicting traffic straight through the final stages of 32 approaches landing at Torrejon AB.