OK, I'll bite......
More disciplined about following good procedures, regulations.
Better educated, esp about aerodynamics, theory of flight, fatigue, aircraft systems, flight physiology
Exposed to wider range of maneuvers--stalls, recovery from unusual attitudes, high performance aircraft. You won't make a stall recovery error if trained repeatedly in stalls, spins and departures from controlled flight.
Get continually debriefed and evaluated for upgrade and promotion.
The first flight into Mogadishu for C-5 was flown by a 1500 hour Captain doing 17.8 hours, non-stop with 4 air refuelings and a combat off-load at a hot airstrip. Do you think the average 1500 commuter pilot could do it.
BTW, I had 1800 hours and flew night checks before going into the service, so I know both sides pretty well. Fly civil now.
GF