Other than I-4, I-Drive, and US192, most of the main routes into and out of the tourist areas of Orlando are toll roads, and they are WORTH EVERY PENNY! The traffic on the 3 above-mentioned roads is horrendous, and will eat into your vacation time like a school of piranhas.
It is possible to avoid the tolls by taking alternate back routes, but it is not worth the time and difficulty involved. I doubt that most drivers spend more than $20 in tolls in the course of an Orlando vacation; much less if you have a tendency to stay put once you reach Lake Buena Vista.