We have rented a house there numerous times, we loved it so much we bought a place there last summer!
You've come to the right board though, there are plenty of helpful people on here to point you in the right direction. Popular rental resorts include:
Windsor Hills
Windsor Palms
Indian Creek
Emerald Island
Websites to find these homes include:
www.vrbo.com
www.windsorhillsrent.com
and more!
Traffic to/from the parks is really not bad at all, at least from these places, they are in many cases closer than many of the resort properties.
Here's a map of the resorts in the area:
http://www.thedibb.co.uk/villa/map.htm
There are TONs of advantages of staying in a home over a resort, your own pool, free internet, better TVs and beds, better furnishings, your own kitchen, many have amenities like free phone calls, and on and on...
Parking in the resorts is free of course, to park at any WDW property is $10 for the day now, and it's good all day at any WDW park.
Disadvantages...well... you don't get the WDW transporation system, you don't get the EMH (extra magic hour), and you don't get to pay more for the "name"! LOL
We've had some of the best vacations we've taken anywhere, EVER, staying offsite in a vacation rental home near Disney, I can't imagine why people still stay onsite to be honest, but hey, I'm biased!