Those lines are there, like others around the engine, to increase the speed at which a motor gets to operating temp. This is done for emissions and fuel economy. Warmer motors that intake warmer air have a leaner fuel/air mixture, or optimum when considering fuel economy. Removing the lines will likely have no tangible positive results. The temperature of the throttle body is irrelevant in the grand scheme of intake temps. Once an engine is warmed up, radiant heat quickly heats up surrounding metal parts, meaning the throttle bodies are hot, no matter whether they have the coolant lines running through them or not. Intakes temps are determined by the IAT sensors and flow by the MAF and MAP sensors.
Moral of the story, disconnecting the lines make no real, tangible difference, performance wise. But if you must, and you think it'll make you happy, by all means do it, just try not to make a mess!
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