I've tried it, but it has no effect on Programmers.SE, even though it seems to work here on meta.
I see it's been only about 6 weeks since this feature was implemented — does it usually take longer than this to make it to other sites?
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As ChrisF pointed out, only a very few of our sites have syntax highlighting enabled.
Syntax highlighting isn't enabled on Programmers, so naturally the syntax highlighting hints don't do anything.