Isn't it distressing that our sport has developed down a path whereby fit, willing and able participants are FORBIDDEN to walk? Under any circumstances! I just find that really sad. I'm not against cart play at all, but one should ALWAYS have the option to walk. The walk, the exercise and being able to feel the landscape pass by under your feet is one of the great joys of golf. Now, there are times and climates in which you might want to ride, even if it is just between the holes, but speaking as someone who has designed a fair few miles of cart paths, we do, as I'm sure comes as no surprise, tend to keep them out of sight and hopefully out of mind of play. This isn't so much of a problem if clubs permit them to run down the fairway, but the experience of the course is truly miserable when carts are confined to the path.
Now, on the flip side, there are clearly great courses in existence that would never have been conceived on those sites without an emphasis on cart play. Take one of my favourite architects Mike Strantz as an example. I can think of three of his courses (Tot Hill Farm, Royal New Kent and Stonehouse) that would never have been built if it wasn't for carts. The layouts are just not practical for an emphasis on walking. Tobacco Road may be a fourth, though I remember walking that without too much stress. On balance, I expect we are more grateful for these and other similar courses being in existence thanks to there being carts to use. Just let us walk if we want to.