I assume you are coming down I-75 from Tennessee to Florida. If so, the only toll road between you and Disney is the Florida Turnpike segment from Wildwood (junction with I-75) to Orlando (junction with I-4). I should remember the tolls as many times as we've been through there, but I don't (probably around $2.50). No big deal.
There are a few other toll plazas on expressways around Orlando (such as when traveling east to Kennedy Space Center), but if you don't venture beyond the immediate Walt Disney, Universal, International Drive, or Kissimmee areas, you probably won't have much occasion to use them.