When I used LyX (years ago) typing in equations was slow and buggy (slow means anything longer than typing in text). Plus it doesn't/didn't export very clean source code and, for people who have used latex in a text editor even for only 3 or 4 years, the menus and toolbars are completely unnecessary: I know 99.9% of the macros I use and the ones I don't know are esoteric.

    latexmk -pvc 

gives continuous compilation from the command line FWIW.