What ages are your kids if you don't mind me asking?
When our kids were younger, while we wouldn't pull them out for a full week, we didn't mind them missing school for part of a week, if it fell into a good vacation time, such as the infamous Jersey week when schools are close on thursday and friday, we would pull them out on the M/T/W. Or the week of thanks giving.
Our kids are now in middle school and it seems like they are doing tons of testing this week prior to the holiday. Teachers i guess feel like they are going to lose traction with the holiday vacation and timed lesson plans to have section test end this week, and start fresh after new years. With an 8th grader getting ready for HS and applications still pending, we wouldn't consider taking them out now that school grades are starting to actually matter.