A PA46 IFR PLT IS VECTORED OFF VGT AND AFTER SIGHTING LAS IS INSTRUCTED TO OVERFLY THE RWY 19 NUMBERS TO THE RWY 25 NUMBERS THEN TO PROCEED ON COURSE.

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I WAS DEPARTING VGT ON THE NOTWN 1 DEP. SHORTLY AFTER TKOF; LAS VEGAS DEP TOOK ME OFF THE DEP AND TURNED ME TOWARD LAS. I WAS ASKED IF I HAD THE LAS ARPT IN SIGHT. I RESPONDED AFFIRMATIVE. I WAS TOLD TO OVERFLY THE NUMBERS 19; THEN THE NUMBERS 25 AND THEN PROCEED ON COURSE TO GFS VOR. (I WAS NEVER ASKED IF I COULD SEE THE RWY ENDS AND NUMBERS!) THERE WAS NO ADVANCE WARNING THAT I WOULD NEED THE LAS ARPT DIAGRAM AND THE WX WAS TOO HAZY TO ALLOW ME TO SEE THE RWY NUMBERS CLRLY. I QUICKLY OBTAINED THE DIAGRAM; AND USED MY GPS AS WELL AS I COULD; BUT THE CTLR WAS UPSET THAT I DID NOT FLY THE REQUESTED PATTERN; AND SAID I GOT INTO HIS DEP AREA. THE RADIOS WERE VERY BUSY; SO I DIDN'T USE AIR TIME TO REPLY THAT NOT EVERYONE KNEW THE LAS FIELD SO WELL THAT THEY'D QUICKLY KNOW WHICH RWY END WAS WHERE WITHOUT REF TO A DIAGRAM. IF THIS IS A CUSTOMARY DETOUR FROM THE SID (AND I SENSE THAT IT IS AS I HEARD OTHERS AFTER ME GET THE SAME INSTRUCTIONS); THERE'S NOTHING ABOUT IT THE BRIEFING ROOM AT LAS OR ON THE DEP PLATES. LOCALS MAY KNOW WHAT TO EXPECT; BUT VERY INFREQUENT VISITORS SUCH AS MYSELF WOULDN'T. AT A MINIMUM; IF THIS IS A CUSTOMARY DEV; THE FACILITY ISSUING THE CLRNC AT VGT SHOULD ASK A PLT AS TO HIS/HER LEVEL OF FAMILIARITY WITH THE DEV FROM THE SID. I TOLD VGT CLRNC AND GND CTL THAT I WAS 'UNFAMILIAR;' AND EVEN HAD CLRNC DELIVERY READ ME THE ENTIRE SID TO DOUBLECHK AND MAKE SURE I HAD IT RIGHT; AS I KNEW I WAS IN BUSY AIRSPACE. ALSO; THE CTLR WHO WANTS TO ISSUE THESE VECTORS SHOULD EITHER 1) ASK THE PLT IF HE/SHE CAN SEE HE CAN SEE THE RWY MARKINGS; NOT JUST THE ARPT; AND IF HE/SHE CAN COMPLY. A VECTOR TO AND FROM THE LAS VOR WOULD BE MUCH MORE HELPFUL AND PRECISE THAN ASKING PLTS ON AN IFR FLT PLAN TO MANEUVER ACCORDING TO MARKINGS ON THE GND.