Researchers at large experiments or laboratories (e.g., CERN or Fermilab) tend to use the same templates, scripts, etc as those who wrote papers before them. Some experiments even have their own guidelines about how any graphics published or presented must look, on top of any requirements from the journal.
As such, the same set of scripts and templates tend to get passed around, to ensure all of those guidelines are met. This also ensures a consistent style is used for all papers from that lab / experiment / group.
Those scripts and templates are developed / passed around largely by grad students and postdocs.
There may be similar templates available for faculty webpages, but they won't be as pretty looking because the need just isn't there. In a journal or conference presentation, you are limited by number of pages or time; therefore, you need to make sure every word is needed, and every figure is conveying as much information as it can while being as clear as it can. You may pay some amount for each figure you put in the paper, so you make sure the ones you have are stellar. There is no such limitation on faculty websites, so there is no incentive to make them look as nice.