Pat, so long as there's someone in a cart in your group to ferry you on a couple of huge distances between tees and greens (from six to seven or nine to ten, for example), I'd say you could walk it comfortably, but as Sven notes there are a couple of long such gaps.
Terry, I would go back any time. I thought the course was challenging, quite often visually stunning, and great fun -- even if it is extremely severe and demanding on a higher handicap player who's hitting it crooked. Hey, it's not Beverly, but what is? If you don't have access to Lost Dunes, the Dunes, or Point O Woods, it is by far the very best option for public access golf in SW Michigan.
As for the pace of play, I think the scorecard in part contributes to the problem. From the back tees the yardage was (as I recall) just over 6900 yards. The high handicapper in our group decided to play with us back there since the next tees were listed at (again from my recollection) around 6200. The course was too much for him from the back, but when he moved up on the back nine there were a couple of holes he felt as if he was playing from the forward tees (he used to be a 12, but age and health issues have taken a toll). Seems to me that they could use one of those combo or members' tee listing on the card. Some from the back, some from the front.