I came to the conclusion, like you, that structure is good. Without structure it’s really hard to get started on things or feel a sense of progress.
Now if i take a long break i treat it like i used to back in college days. I have a schedule, high level goals and daily to-do lists. Those lists have productive things as well as free time or gaps of a fixed length to fill with whatever i want.
Sounds hellish when i write it out but without it I’m all about cat videos and noodling around on my guitar. Suddenly a month has passed.