You're right that a sample size of one isn't reliable data -- it is confirmation bias. Interpreting phototaxis in animals is challenging enough, but interpreting it where there is no control condition, and the experimental condition is unmeasured, really isn't possible. It is very likely that your snake isn't getting enough UV to make a difference one way or the other. Without testing (both by you and many, many more keepers), we'll really never know. The UVB push depends a lot on unreliable anecdote and sloppy data, and that's not a great way to move care in the right direction.
FWIW, I use UVB on about a half dozen enclosures for herps that aren't snakes, but it is metered and used for a discernible goal (not just "benefit"). UVB is a very useful tool, but that doesn't mean that it is appropriate everywhere and just for the heck of it.
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