Doing the binary mapping just reduces your writing a little.
That's of course dependent on the algorithm you use.
Technically, you could also ask the spell to run through a series of questions and spit out the final answer in 1 question.
eg.
"Starting from qn 1, what is the final answer to this series of questions assuming all the questions were answered accurately?"
qn1: Are all the enemies in the dungeon we're about to enter 'creatures'?
If yes, goto qn2, if no, goto qn3
qn2: Do they have bad will saves?
If yes...
qnX: Do <...> ?
If yes, then answer "X", if no, goto qn Y.