code-golf is currently used on 40 of 62 questions. Like other sites I've seen launched, such a tag allows users to throw it on their questions without having to bother thinking of a better, more specific, more useful tag.
Should the tag be blacklisted so it cannot be used?
On Electronics and Robotics, we (unfortunately) have the
[electronics] tag. While it's true that not every question on E&R will be electronics related (it could be software, robotics, or higher-level project management stuff), we are steadily trying to remove said tags because that tag alone is near-meaningless as it encompasses too much (e.g. analog vs. digital).
That said, that rationale isn't as good here as software is less broad (at least with respect to most of the puzzles I've seen).
Perhaps the root question here is: Is tagging a question with only code-golf acceptable? If not, how can it be avoided?