Man, golf can be pretty hectic!
When walking, especially with a cart group, there is almost no downtime.
While walking down the fairway, I have to steal away a few seconds to drink from my thermos or eat my beef jerky.
You don't want to rustle through your stuff while people are teeing off
After the hole, trying to walk off the hole and enter my putts into my phone tracker. Then walking up to the next tee to mark my GPS club tracker.
I think people overstate the idle downtime of golf. I have no time to stop and relax!