I recently turned the combat VFX back on. As a SGE main, it makes the fights far more engaging if I have to pay close enough attention to see the telegraphs through all the visual clutter. Plus I can more readily see what everyone else is doing, at least on the classes I've played myself.

So I think it's nice the SE gave us the choice, on a fight-by-fight basis, of whether to have the flashy but cluttering effects or not.