We walked to TTC in about 8 minutes, which seems shorter than waiting for monorail, stopping at GH and getting down to bus area. However, we had our car and did not rely in bus transport, so I'm not sure if buses are slower at one than the other.
Definitely take the boat from Poly to MK. Then when you get off the boat just take a right and walk down to the bus area. They have buses to all resorts there.