Edit- I do consider photography a form of art and when I said learn, I meant more than just the tech aspect.
Learning the tech side of it would be very educational and would be helpful if you wanted to be a camera salesman. As a photographer I think it is useless information unless you know how you can apply the information in your vision.
I would prefer the artsie fartsie classes over the technical ones. It is easy for me as a gear head to look at all the data and figure out how things work, I can get that by reading, research and the internet. Putting it all together in a vision and creating a beautiful picture, I find that a bit tougher for my analytical mind.
Not as useless as you would think... Think of it like this... Your shooting a couple outdoors, open sun, you set your exposure... all of a sudden, a cloud comes overhead... you need to instinctively know to compensate... is it 1 stop or 2? Is it a thick light killing cloud or a thin softbox style cloud... Then you go into an open shade... what affect does that have not only on exposure but color? Maybe you want to throw on a polarizer... maybe a sun filter... 1/3 stop or 1/2... maybe you switch lenses to a macro lenses to do artsie fartsie shots of your clients eyes... your macro so your losing light... you need to know to compensate... This basic stuff is stuff a lot of "pros" miss on a daily occurrence... this is the stuff you get hammered into your head from day 1 and this is what will be the difference in if you get "that shot" or you dont... It will make the difference if your considered a shoot and burner or highly regarding professional commanding top dollar... Sometimes it does matter... Technical stuff is necessary, but it isn't everything...
Well I think your comments fall under the last part of the sentence which says "unless you can apply the information in your vision". But the techie stuff runs deeper than this on CR and often revolves around things such as sensor and lens comparisons and how they work. Some things are nice to know, but you need to ask yourself how does this apply to what I want to do?