I'll preface this by saying I've never been for Veteran's Day...so this is only my impression...generally everything I've read is that it may be a slightly more crowded day than the days around it, but not the high crowds of Thanksgiving. Since it falls on a Friday, you may get more locals coming for a long weekend, but since no school systems have more than a single day off with Thanksgiving break around the corner, it isn't a super crowded day. However, since Friday is also the last weekend of Food & Wine, AND more people will be off for the holiday, I expect Epcot to be the most crowded on that day.
(We actually have a day off the 11th for Vetran's day, and another day off the next week for PTC (parent teacher conference) and so are taking advantage of two off days from school.)