what would be a more derogatory term for being overly laid back?

Hi sol - been a while!

You can often get the derogatory term by saying "So x that s/he is y" and see which y fits best, thus:

So laid-back that s/he is comatose

Fisk

P.S. Of course "anal" is short for the Freudian term "anally-retentive" for those who didn't know...