It's weird, since I also have almost that "letdown" feeling, like you have after you have thrown a wedding or Bar Mitzvah or another big party that you planned and planned.
Then it is over, and you are left with lots of memories.
The process has been arduous, but very memorable. We also met fabulous people, ate in neat places, had lots and lots of talking on various confined car trips and air trips.
It almost makes me think that parents who get the "easy way out" (i.e., their kids just mail out apps
) are really missing something special with their kids. Now THAT is a surprising feeling that I wasn't expecting at all!