"Time to market" of the paper (e.g., shorter review time) as Keelan noted might be a reason.
It might be also related to what is indexed by google scholar vs. more official indexes. (see link below). For example, google scholar counts as a citation basically everything that looks like a citation, regardless of whether it was peer-reviewed or not. It is possible, that some fields are more reluctant adopting such metrics. For example, arXiv platform has been long ago a popular in math field. But those papers are not peer-reviewed, at least for posting them, there is no requirement of peer-review. In other domains (I think biology) preprints have become popular more recently.
Another reason: in CS there are a lot of people outside academia. They are interested whether someone relevant cited their paper (or whatever it was). This boosts google scholar use. In many other fields researchers work only in academia. the official representatives might tend to rely more on official indices (e.g., for promotion etc).
It is also possible that some fields are more conservative than others. CS is in general a relatively young field. Also, it is more natural for CS to adopt new technologies. But think about philosophy field that has longer traditions. People in such fields also less care about technological innovations.