I originally used a lot of gnuplot in my early work. However, I've started to do most of my work within python using matplotlib. However, gnuplot is still very useful in early stages of work or if you're not planning to do a lot of automated work.
gnuplot> set title "Raman Spectra for UO2 (LDA+U/Dorado)"
gnuplot> set xlabel "Wavenumber [1/cm]"
gnuplot> set ylabel "Intensity [a.u.]"
gnuplot> plot "ramanspectra.dat" using 1:2 w lp