RC flying is not generally a relaxing activity. Unless you're flying something slow and lazy, it takes nearly complete concentration for 10-15 minutes at a time. Which is why you don't normally land, refuel, and go right back up. But it doesn't have to be a constant worry. I don't use a checklist, but I try to stick to a normal routine so I don't forget anything, and I'm always looking over the airframe for anything broken or loose during cleanup.