I'm a high school teacher, and I understand the hesitation about sending out daily e-mails to make sure that your child keeps on top of assignments. To you it's a quick message.
To me it is much more than that. I don't know how your child's classes are, but I do not rely on the textbook to do my teaching. It is difficult, if not impossible for me to convey what we covered in a day by typing a five minute e-mail. That means I would have to type up the class notes for the day and attach images and primary source documents. To do less would cheapen what I am trying to teach and put your child behind when he returns. This could take me anywhere from 30 minutes to an hour. I'm not happy about having to do that because you want to take your family to Disney World during school.
Then, what happens when your child has questions? More e-mail for me. Then your child is understandably behind when he returns, which means I will have to spend time with him after school. Don't get me wrong, I am happy to do it, but realize that my work day is now increased because I still have papers to grade and lessons to prepare. All because you wanted to go on vacation.
I hope your family has a wonderful time on vacation, but please cut you kids teachers some slack.
Melissa