Sherbeth should get you to AK a lot faster than World if you're staying on the West side of Disney. Not sure about MK or Epcot, but at least you won't have to deal with 192.
Be careful not to speed. I often see police on this road (as well as many speeders). One day the police were even checking for seatbelt use. I do love this road, but for any park other than AK, 192 would be faster if traffic isn't heavy.