I agree with the PP that you will get varying postings on resort transportation.
To me, it isn't a real vacation unless you don't have to worry about picking up a rental car, getting gas, parking, etc. I love the ease of letting someone else do the driving.
You will find different levels of easy tranportation, depending on what time of year you go. If it is a very busy time of year, like any holiday, or say right after an event, such as EMH's or Illuminations, there are more buses, but a ton of people wanting to get back to the resort all at one time.
Values tend to be a lot more crowded on the buses because more families are trying to save money, like not renting a car. The mods are fairly good, although POR can get packed, if they pick up POFQ first. If you go with POR or POFQ, you have the extra added transportation of the water taxi to DTD, which also has a transfer station to all of the resorts.
On the deluxes, it depends on whether you stay on the monorail loop, like CR, Poly, and GF where you can hop on the monorail to MK, or to TTC to transfer to Epcot.
At BC/YC/BW/Swan/Dolphin, you also have the extra added ferry boats to Epcot and DHS, as well as being able to walk over to Epcot.
It is all a matter of taste.