IIRC my suggestion was based on the gist linked in the Notes for example in: mne.Evoked — MNE 1.0.dev0 documentation
Personally I don’t bother to use savgol filtering because using FIR filter design for low-pass / smoothing I can immediately characterize the effects on the signals. With savgol it’s a bit more of a guessing game for me at least (not that familiar with the technique)
I don’t know of any that have used it. From a quick google search of “Savitzky-Golay electroencephalography” I found at least: