If you drive direct from TO to WDW, you'll be driving mainly through the middle of North America, and not much along the coastline.
As one of the earlier posters advised, you can drive from TO to the Atlantic Ocean, and then go south to WDW. But there is a few drawbacks:
1) it's a longer drive - but longer is a relative term (as your starting point is Australia, which is already a long way away)
2) the drive south along the Eastern seaboard (usually the route is I-95) does not allow for many views of the water. You may get a view of New York City (as long as you don't take any of the ring roads around NYC), but view of the others cities are minimal (only notable exception is Baltimore, plus a short view of Washington, DC).
For more direct routes between TO and WDW, the two main alternatives are 401 to I-75, and I-90,79,77,26,95 (the I-90.79,77,26,95 route being the quickest from the GTA). My preferred route is I-90/79/77/26/95 as the drive is easy, plus lots of nice scenery is West Virginia
http://www.mapquest.com/directions/...z=&2pn=&2a=&2c=lake+buena+vista&2s=fl&2z=&r=f
If you have the time to stop while driving down the East Coast to visit cities such as NYC, Washington,I-95 is a good route.