Just thought of another busy-hands craft that you can do with minimal attention: latch hooking. I did a small rug way back when. We used it in the bathroom in front of the sink, and it was so soft and cushy. That's another craft that once you have things lined up and started, you can go for a while before having to pay attention again.
I would also say counted cross stitching on large-count mesh. I did a Christmas wreath one year for my Mom-in-Law, a tray insert on tiny 24-count cloth. My Mom loved it! Wanted one for herself. Well, that tray took me 83 1/2 hours of stitching (I kept count, and will never forget. I ended up with crossed eyes and an upset tummy more than one night while working on it) so I wasn't going to make another, no matter how much I loved my Mom. Still do, in fact.
Anyway, I ended up doing the same pattern for her, but on 6-count Herta cloth, using knitting yarn and a fat, no-point needle. I could work that thing with my eyes straight ahead. I did need to count, but back then I could still walk and chew gum. Now I have trouble just walking some days!