I def forget to make my bed all the time. It adds nothing to my day. I'll make it if I need it to be neat to use it to fold laundry, or if I just washed my sheets.
I'm really bad about making my bed, so most of the time it's not at all. I'll make it if somebody is coming over or whenever I change the sheets.
Only about once a week for me, but that's usually when I decide to wash my sheets, or lay out clothes for me to pack on a trip.
Ah interesting, I thought I was lazy for waiting until later in the day to make it, glad I'm not the only one.