A B737 CAPT LNDG AT LGA EXPRESSED CONCERN REGARDING CTLR'S RWY EXIT INSTRUCTIONS ISSUED DURING HIGH SPD/WORKLOAD PERIOD.

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LGA TWR CONTINUES TO GIVE A CONTINUOUS LITANY OF RAPID AND COMPLEX TAXI INSTRUCTIONS TO AIRPLANES DURING HIGH SPD/WORKLOAD ON THE LNDG ROLLOUT. OFTEN IN EXTREMELY POOR WX AND RWY SURFACE CONDITIONS; ALTHOUGH THIS SHOULD NEVER OCCUR ANYWAY. TODAY IT WAS DURING THE ROLLOUT FROM AN EXPRESSWAY VISUAL RWY 31. ON THIS FLT; THE FO HAD JUST LOWERED THE NOSE TO THE RWY WHEN WE (UNBELIEVABLY) RECEIVED INSTRUCTIONS TO 'EXIT TXWY TANGO; ETC.' WE WERE TRAVELING AT APPROX 125 KTS OR SO. AS WE CONTINUED OUR DECELERATION; THE CTLR THEN RE-KEYED THE MIKE AND SAID SOMETHING TO THE EFFECT; 'EXIT TXWY SIERRA; TURN R ON TXWY BRAVO AND CONTACT GND CTL ON 121.7 (WITH NO BREAK AS WE ROLLED ON) IF UNABLE; EXIT TXWY ROMEO; ETC; ETC.' THE CONTINUOUS SECOND CALL WAS FROM AROUND 100 KTS DOWN TO ABOUT 50 KTS. THIS SHOULD NOT HAVE TO BE SAID; BUT IN AN ACFT WEIGHING AROUND 135000 LBS OR MORE; ON POOR RWYS; TRYING TO SAFELY DECELERATE WITH THE TWR CONSTANTLY YACKING TAXI INSTRUCTIONS THAT SHOULD NOT EVEN BE GIVEN AT THAT TIME; IS A RECIPE FOR DISASTER. ALTHOUGH MANY TWRS AROUND THE COUNTRY ARE DOING THIS MORE AND MORE; AND MANY PLTS ARE UNWISELY RESPONDING AND RUSHING TO COMPLY; LGA TWR IS THE WORST. SHORT RWYS SURROUNDED BY WATER; OFTEN IN MARGINAL WX AND BAD RWY CONDITIONS WITH HEAVY TFC AND TOO CLOSE FINAL SPACING OBVIOUSLY MAKE FOR AN OP THAT IS JUST RIDICULOUS.