Hey. I think it's totally normal to miss your job, or at least aspects of it. It's something you did for a long by time. I'm not on disability but I am on summer holiday as I am a teacher, and while I can't wait for vacations while working, when I am off I always miss my job. I think I partly miss my coworker friends that I go from seeing every day to maybe once a month. And I love the kids and opportunities to be creative. Working keeps my brain busy so I don't end up stuck up there too long in the crazy. Having a regular schedule is also something that I don't miss per say but that definitely keeps me healthier than being able to stay up late and sleep late.
I think most people we work for end up being jerks. I love my job but hate all the BS and beaurocratic stupidity and micromanaging involved that complicates things and makes me miserable.