ACR-MDT ON VISUAL APCH TO GCN HAD NMAC WITH VFR-SMT. COMPLAINT ABOUT TRAFFIC VOLUME AND APPARENT LACK OF ATC SERVICES BY TWR AND ARTCC.

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THIS RPT IS TO VOICE MY CONCERN OVER THE FREQUENT SATURATION OF THE GCN ATA. AS EXAMPLES; I WILL STATE A COUPLE OF OCCURRENCES THAT TOOK PLACE DURING THE PEAK TFC HRS. DURING THE 10 MINS BEFORE LNDG AT GCN; ENRTE FROM LAS; VIGILANCE IS NOT ADEQUATE. ZLA IS EITHER TOO BUSY WITH OTHER TFC OR TOO BUSY OFFERING TFC ADVISORIES TO YOURSELF TO ALLOW FOR A TIMELY HDOF TO TWR. WHEN THIS OCCURS YOU FIND YOURSELF IN THE MIDDLE OF WHAT SEEMS LIKE A HORNET'S NEST W/O ANY SEQUENCING. 1) ENRTE LAS TO GCN. LATE HDOF TO TWR. ABOUT TO ENTER RIGHT DOWNWIND FOR RWY 21 BEFORE GETTING A WORD IN TO TWR. SMA NW OF THE ARPT CONFUSED ABOUT HIS INSTRUCTIONS. TWR FINALLY GOT THE WORD TO HIM TO TURN SW AND RE-ENTER RIGHT DOWNWIND. HAD TO MAKE CLOSE IN DOWNWIND TO AVOID SMA ON A SW HDG. TWR INFORMED US WE WERE #3. SPOTTED THE #2 ACFT AND FOLLOWED HIM ON RIGHT BASE. WHEN TURNING FINAL AN AIR TAXI SMT Y WAS 300' BELOW US; ALSO TURNING FINAL (WE SHOULD HAVE BEEN #4). TWR THEN INSTRUCTED US TO MAKE A LEFT 270 DEG TURN AND RE-ENTER FINAL. THIS TURNED US TOWARD 2 SMT'S ON AN OVERHEAD APCH. THEY THEN WERE INSTRUCTED TO MAKE A LEFT 360 DEG TURN. 2) LAS TO GCN. SW OF FIELD; HDOF TO TWR. INSTRUCTIONS ISSUED TO GO NW OF FIELD AND ENTER LEFT DOWNWIND FOR RWY 3. #3 FOLLOW 2 ACFT ON DOWNWIND. NUMEROUS DEPS WITH LEFT TURNOUTS TO LAS. WE WERE PLACED RIGHT IN THE DEP PATHS. THERE ARE TOO MANY AIR TAXIS OPERATING AT THE SAME TIME. APCH RADAR WITH DISCRETE FREQ IS A MUST. GCN IS A COLLISION WAITING TO HAPPEN!