I just finished up my 60's on my horde side with 9 days to spare.

So i now i have atleast a 60 of every class. This isnt for everyone cause you can seriously get burnt out.

One thing i did was summon all groups to dalaran and set hearth there.
Made sure all free levels were granted to main account.
I didnt worry much about flight paths because i dont do much old world content, but i'm sure that will bite me in the butt.

Like you, i'm in that spot i'm trying to tie up all the loose ends.