I can see why missing a holiday would suck, but you don't see the appeal of having a relatively confined and well-defined problem to solve? I find a good debugging very soothing after long stretches of greenfield development. Mind you, I don't want to miss a holiday over it, and I'd rather go and build new shit all day most days, but reality is, you have to debug sometimes, and you might as well take whatever satisfaction you can from the process.