I have been lately using optical viewfinder (OVF) extensively with my Fuji X100. Such a great feeling to use a superbly bright viewfinder. No electronic one can compete. OVF is so fast – no lack of course. And you can see more than you get. Very handy indeed. I have not been using any photo preview with my cameras for some time now. I do not need always the immediate response to see the shot I just took. This of course makes shooting so much faster and it also makes me feel more free. Just concentrate on shooting not previewing the shots.
If your camera has an OVF just use it. Learn it. It will be fun.
Few photos shot using OVF with my X100: