I was at Camelback yesterday afternoon, which has just recently reopened from overseeding. As a result, they are playing as a cart path only facility. Despite that, I had to bring up the idea of walking and was looked at strangely when I declined the cart.
The course is very walkable (Padre, anyway, it looks like the Indian bend would be a much longer hike, though still walkable). The problem in Arizona is always going to be that there are 4-5 months out of the year when walking is not entirely reasonable for anyone. But yesterday's temps were only in the low 90s and I suspect those who were walking to and from their carts all day walked just as much as I did.