I've had my G1 now for a bit over a year. It has the best viewfinder I've ever used, including SLR, medium and large format (well, okay, my 4x5 Speed Graphic is big, but the corners are dark).
I like being able to manually focus in extremely dim light with the G1's EVF. I like the 1 second review I've programmed the camera to display after each exposure. I like the autofocus area and exposure information available to me while I'm composing. I like viewing the image at the taking aperture and shutter speed ahead of the exposure. I even like the electronically-amplified image available under darkly-lit conditions, since it enables me to see well enough to actually focus and compose, something I wouldn't be able to do with an optical viewfinder.
Low-quality EVFs are yesterday; one shouldn't judge them by what past cameras have offered; high-quality EVFs are the future; if you haven't used a Lumix G1 or GH-1 you don't know what I'm talking about. It's like comparing a 1950's tubed TV with HDTV. And they will only get better with time.
~Joe