From the airport IF Magical Express isn't what you want to go with...use the towncar service...
we've used Tiffany Towncar on the last 2 trips and have been very pleased. Like a previous poster said, the TTC driver is waiting for you at the bottom of the escalator, helped us carry our bags, is a short walk or on our last trip the driver brought the car to the curbside for us. We didn't have to wait for anyone to call the service...they were there waiting. We opted for the 20 mins. grocery stop to grab water, drinks, breakfast foods and snacks...our plane touched down at 11:20am...we were at SSR at 12:45...we had one of the farthest gates, made restroom stops on the way to the tram, stopped at the grocery store, so not bad...much better than the bus services. Plus, if you have a Passporter's guide you can save $8 on the cost of the car with Tiffany...coupon in the back of the book.
As for getting from resort to resort type of stuff...taxi...
We decided to grab a taxi to get from SSR to WL for a meal we were having and didn't want to be late using the WDW bus transportation...it took us about 10mins. and cost $13.50...most of that cost was because we incurred 2 red lights and the fare ticker keeps going for that...it was still worth it!
Hope this helps!