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First I’ve heard of file names being significant but I use WordPress so maybe there’s a detail I’ve missed. Alt text is useful for both screen readers and also for web crawlers. I always try and add at least my main keyword of the post or the page into a couple of pictures. Doing it too much could be construed as keyword stuffing though and from what I understand it, Google has tried to sniff that out and penalise it accordingly.
The last thing they want (or at least used to want) was the whole web to get worse in order to change their rank on search engines as that would lessen it’s usefulness eventually.
