This is my 20th week at this job, and the only time I've taken off has been 6 vacation days for my trip to the UK. And there was once or twice that I took the early train (4:00 instead of 5:45) because I had stuff going on earlyish after work. No sick days. No personal days.
Compare this to my previous two jobs, where I made sure to take all of my sick days (mostly just as days to get some extra sleep) and personal days. I probably would have taken 3 or 4 days off during an equivalent amount of time.
At my current job, however, I don't think I could just wake up one morning and decide I didn't want to go into work (unless I were actually sick). I mean, yes, they can handle a day without me (although it might not be very pretty if that happened while no one else in Production is around, as is the case this week), but things would run much more smoothly if we were able to prepare for a day off, letting other people know about things that would be coming up that day and would need to be watched.
I think what I should do is plan a week of vacation at some point. If the house gets sold soon enough, then maybe I'll plan it around that. If not, then I should probably just pick a week where it looks like the production schedule will be light. We'll see in the next couple of weeks, probably.