Think about whom you're going to miss from the senior class. The more people you think of, the harder it is to let them go. Maybe if you don't feel attached to any of the seniors, graduation is just another day. Last year, it meant move-out day. This year , it will mean the weekend before finals.
Graduation can mean many different things.
Of course, sentimentality isn't everything. There's summer vacation to look forward to. Ecstatic sophomores and juniors have moved one step closer to their graduation. Seniors start anticipating their first day of college. The cycle continues.