A B737 FO RPT ON A HDG TRACK DEV AFTER FAILING TO ENTER THE CORRECT TRANSITION INTO THE FMC WHEN DEP LAS; NV.

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ON THE 4TH LEG OF MY LAST DAY OF 5 DAYS STRAIGHT; I GOT AN RNAV CLRNC (WILD 1) FOR MY LEG FROM LAS. I CHK OR CIRCLE ITEMS ON THE SHEET AS THEY ARE READ TO ME. IN THIS CASE; I CHKED INW TRANSITION; WHICH WAS IN PARENTHESIS NEXT TO THE NORMAL PGS TRANSITION. I HAD ALREADY ENTERED THE RTE OF FLT INTO THE FMC. I THEN VERIFIED THE DATA AGAINST THE RELEASE SEEING THAT WAS FAMILIAR; YET FAILING TO CHANGE THE TRANSITION. AFTER THE BEFORE START CHKLIST; AS NORMAL; I STATED THE SID; ALT AND SPECIAL; FAILING TO NOTE THE TRANSITION. AT CRUISE ALT; A FEW MINS AFTER THE AIRPLANE TURNED TOWARD PGS; CTR ASKED US WHAT OUR TRANSITION WAS. I THEN SAW THE CHK AND REALIZED THE MISTAKE. CTR GAVE US A VECTOR; AND SAID IT WAS NO PROB. IT SEEMS THEY ARE MORE VIGILANT WHILE WE'RE FLYING THE NEW SIDS AND STARS. I HAVE NO EXCUSE FOR ALLOWING MY COMPLACENCY TO CAUSE THIS ERROR AND WILL NOT ALLOW THIS 'GOTCHA' TO 'GET ME' AGAIN. NOT EXCUSES; BUT REQUESTED POSSIBLE FACTORS ARE OFFERED BELOW: DURING MY FIRST 3 RNAV DEPS/ARRS (ON THIS PAIRING); WE WERE VECTORED OFF AND DID NOT FLY RNAV FOR VERY LONG. I MAY HAVE (SUBCONSCIOUSLY) THOUGHT WE'D BE ON A MORE DIRECT CLRNC BY THEN AND NOT BE RNAV-ING. STILL NO EXCUSE THOUGH. THE SPD AND ROUTINE NATURE OF MY ROUTINES CONTRIBUTED TO MY COMPLACENCY. VERY OFTEN WE HEAR 'CLRED AS FILED.' WORKING 11 OUT OF 16 DAYS -- 5 ON; 2 OFF; 5 ON; WITH 1 COMMUTE. RECOMMENDATIONS: FLYING RNAV ARRS/DEPS DECREASES DIALOGUE BTWN PLTS AND CTLRS. DIALOGUE THAT WE ARE USED TO ENABLES MINOR ERRORS OR MISUNDERSTANDING TO BE MORE QUICKLY RESOLVED BEFORE THEY BECOME GROSS ERRORS. THEREFORE HAVE A COMPLETE UNDERSTANDING OF WHERE YOU TOLD THE ACFT TO GO VIA THE DEP/ARR. GO TO A PACE COMMENSURATE WITH CONDITIONS. SPD SHOULD NOT BE FAVORED OVER ACCURACY; ESPECIALLY TOWARDS THE END OF A TRIP. WORK SMARTER; NOT HARDER.