For quick plotting I use this gist for gnuplot, https://gist.github.com/jxy/88f2972d3994dfea06fd2d3833b7ac8a which generates an ascii art plot.

But I don't really use scripts for other gnuplot terminals, because custom tailoring for individual data set is always required to make any figure presentable. I usually go through ConTeXt to generate PDF file for its TeX features.