Terry,
Oddly, I never thought about that, even though I spent an hour or so using my G on a tripod in the last two days. Most of that time, it would have been extremely uncomfortable, if not impossible to use the optical viewfinder. I remember one shot in particular where my head would have cast an ugly shadow across the image--I had to work a bit to keep my shutter finger out of the way. I should have used the remote, I know. As it was, it was dead simple to frame the images exactly. Did I mention I was outdoors, in bright sunlight? No issues with the LCD. Just twist it to make it sharp and clear again.
I will say that there are times when it would be convenient to squint through the optical viewfinder (dim as it is). Panning with a fast object (maybe a bird, instead of an athlete). Hmm--thought I had more examples. I'm sure others will pipe up. I would definitely want to upgrade to a camera with TTL in addition to twist LCD, no question. But like you, I hope I'm not forced into an eye-level only camera. I really don't think it will come to that.