Lines composed over three thousand miles from Tinturn Abbey

In Lines Composed Over Three Thousand Miles from Tinturn Abbey, Billy Collins writes:

I was here before, a long time ago,
and now I am here again
is an observation that occurs in poetry
as frequently as rain occurs in life

and much of the rest of the poem is about

But the feeling is always the same.
It was better the first time.
This time is not nearly as good.
I'm not feeling as chipper as I did back then.

Which, I know, is an awfully common feeling.  More common than rain.  But I don't feel it.