I always find it both invigorating and exhausting to go to conferences. It is fun to go to ALA and see those friends and colleagues who I see generally twice a year. There are so many who are great people.
It is also exhausting being in a new city, learning the way around. There are the early mornings and late evenings. Then there is the travel. Airports are not much fun after 2001.
I always feel slightly blue, and certainly this year is no exception.