I am the king of routine. I work the early shift six days a week. Even on my day off I maintain my 8-345 sleep schedule. On work days, my morning routine is down to the minute without even looking at the clock. I'm in the shower at 409, out the door at 428, rolling into work at 446.
On my day off, I have structure as well. I hit the laundromat at their 5am open time, usually arriving at 446. I hit the grocery store at 645, when it's nice and empty, visit my mother and grandmother, then head home before traffic picks up.
When my routine is disrupted I get anxiety. Therefore, I do not disrupt my routine. I haven't taken a vacation since 2012, I've had one three day weekend, and two two day weekends in the last three years.