After the gee whiz factor, it was a great illustration of wind movement in high and low pressure systems. Imagining weather and wind movement is high on my list of pilot skills, and that started 30+ years ago when I was hang gliding. There's nothing like a 50 mph gust front to ruin an otherwise great afternoon of mountain soaring.
As for flight planning, I doubt that there was any intention on the part of the designer to do use the tool for that. However, in terms of flight planning, I was intrigued with how the map might be able provide some general information on where to find the best winds and weather on a long XC. It highlights the adage - 'time to spare, go by air.' For short hops - say a couple hundred miles or less, which is what most of my XC flying is, it didn't seem very useful beyond perhaps suggesting what's already obvious.
But, as a visualization tool, which I think is far more important than my formal flight training would suggest, I think it's great. I wonder if it might actually be helpful in predicting turbulence or mountain wave conditions. If so, that would be a pretty helpful flight planning tool.
