My only experience with an EVF is on the M5. (PatrickH nicely summed up the times when I would use the M system.) On some occasions as a tourist or for quick family shots, I can be distracted from checking the exposure meter. BUT the EVF always lets me know if I have an OOPS! exposure setting.

I have a fully manual Rokinon 12 mm lens for the M5, so the focus peaking in the EVF is a major plus when I use that lens.

For occasions when I am attending to the photography, I use my DSLR. Then I still like the OVF a little better. Sometimes the color rendition in the EVF seems slightly off, which can be distracting.