re: Is Water Vapor a Greenhouse Gas? If not what are the implications?

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Clouds aren't water vapor, they're condensation (liquid water suspended in air by wind and temperature differences among a variety of factors). Clouds reflect heat above them, but hold in heat beneath them. That makes them an insulator, but not a greenhouse due to the huge amounts of heat they repel. Even if it feels hotter in a humid area, the temperature isn't actually any higher. It just "feels" hotter due to the humidity. Humidity also negates much of our natural cooling systems by preventing perspiration from evaporating.

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Totally agree.

In fact in the video I recommended watching in the OP the author records temperatures in Huntsville, AL and Las Vegas, NV which both are on the same latitude (same sun exposure) and sufficiently inland to not have a seabreeze effect. The primary difference between the two different cities is relative humidity (water vapor concentrations). It can be observed that Huntsville has lower highs and higher lows due to the negative feedback of the higher concentration of water vapor.

Albeit, some people describe Huntsville as hotter due to the lack of evaporation on your skin in Huntsville, due to higher humidity. Huntsville is clearly cooler than Las Vegas due to the negative feedback on temperature due to water vapor.