There are lots of toll roads in Central Florida. Most toll booths are manned, and can provide change. But some are automated and require exact change (quarters). For example, coming in from the airport on the 417 greenway you will encounter two manned toll booths where you pay one dollar at each booth. When you exit at Osceola Pkwy to get to WDW there is an unmanned booth where you pay an additional quarter.
Florida does have an electronic pass system (I think it's called E-Pass), and at least one lane will be reserved for those vehicles. You have to watch the signs as you approach and stay out of the E-Pass lanes. BTW if you have one of those electronic systems on your car from another state, it will NOT work here in Florida. E-Pass is not compatible with systems used in other states.