Yeah, they can get crazy.
We accidentally discovered the best way to go last time. I think ME uses this route.
Once you get your rental car, head towards the South Exit to Toll 417. Turn right onto 417 (or just follow the signs to Disney World/Tampa). This road should just lead you straight to WDW. There will be 2 tolls along the way. One I think was $1.75 and the other one I think was $2.00. The Exact Coins booth is usually to the left. Big Blue sign, can't miss them.
After you pay the 2nd toll,
You will see a sign that says "Magic Kingdom, Hollywood Studios, Animal Kingdom, 4 Miles." Immediately after there is another sign for "Exit 6, International Drive. To: 536, 535, I-4 East. 3/4 mile."
A little further down the road you will see another sign that says "Exit 6. World Center Dr. EPCOT, Downtown Disney, Next Right."
Take Exit 6 for International Drive/World Center Drive. If you keep going to Exit 3, you'll have to pay another toll at this exit. Unless you don't mind paying another toll, then you can just proceed to Exit 3. There is no toll at Exit 6.
Keep going on World Center Drive and eventually you'll see this.