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Regardless of whether or how much value is placed by search engines today, there's no guarantee of the situation staying the same. Algos aren't fixed, and weighting is liable to change at any time. The best thing to do is to be prepared, and be kind to users.
Some surf without images, and with no alt tags it gets tricky to see what the hell is going on.
True. But, this is only true if the alt attribute is used correctly. If it stuffed with a comma separated list of keyword phrases and/or text that is not descriptive of the image, then they are useless from a usability/accessibility standpoint.