I kind of miss going to 忘年会 (end of year parties, usually held by a company or workplace for its employees). Survey says, however, that most office workers in Japan don't really enjoy them.
According to a Metarika study, 62.6% of office workers regard company drinking parties (飲み会) as a pain in butt (37.4% saying they are fun)
The second question there asks respondents how often their work holds these (obligatory) drinking parties. The responses from top to bottom are "1-4 times a month," "once or twice every half year," or "once or twice a year, almost never."
Maybe I enjoyed my schools' parties more than the typical employee because (a) I wasn't worked to the bone and spending almost every waking hour with my coworkers and (b) I didn't really feel obligated to attend; I just did most of the time because it was fun. Or maybe it's just because teachers are awesome and know how to throw a beastly party.