I do a lot of resort hopping myself, but rarely resort to resort.
I generally stay at the values, but only have breakfast there first thing in the morning.
What you have to do to avoid the transfers is to plan around park times and the transportation.
For example, if I want to have a late dinner in the Epcot resort area after Illuminations, then I make my ADR on a night when the Studios is having evening EMH and will still be open when my dinner is through.
That way I leave Epcot out the IG, then walk to my dinner ADR, then when dinner is over walk over to the Studios and take a bus back to my value resort.
If I want to experience a different resort for lunch, then I take bus directly to that resort from a theme park, have lunch, stroll the grounds, find a comfy chair in the corner of the lobby for a rest, or find a shaded bench on the grounds for a rest. I rarely go back to my value resort for lunch.
If I do go back to my value resort for lunch, then I make my dinner ADR in a theme park, or at a resort that I can walk/monorail to/from a theme park.
For example, if I go back to the resort and rest, then my dinner ADR will either at one of the Epcot resorts, or one of the Magic Kingdom resorts, then I just take a bus to either the Studios or Magic Kingdom, then walk to my dinner, then after dinner, go to either MK, Epcot, or the Studios.
So with a little advance planning it is quite possible to experience lots of good meals at many of the resorts and not spend a lot of time on transportation.
I have never understood why folks are trying to get to another resort for dinner in the evening from "their" resort. Just go directly from the park. For 95% of the restaurants at WDW, there is no need to go back to "dress" for dinner.
Now, if you are planning a nice dinner, then yes, go back to the room and change. But allow plenty of time for that. Don't go to a theme park at all that afternoon, get ready for dinner, and plan your dinner time for when you can get easy transportation there.