Some of these "celebrating" days are just another day off from work for me--if I'm lucky. My big holidays (meaning parties, Church, etc., etc.) are 7/4, Easter (I'm Catholic), Christmas and Thanksgiving. I never get sick of holidays because 1) I get a break from work, and 2) I get to be with my family. (The period between Presidents' Day (February) and Memorial Day feels so long because we don't get time off from work unless we request it.)
When I lived in Canada, we would get a lot more time off for some of the holidays than we would in the US.