I thought about this and, even if you could go to each one in 15 minutes travel time you have 15 min. to MK, 15 to DHS (MGM), 15 to AK, 15 back to Pop, 15 back to DHS, 15 to Epcot, 15 to MK, then 15 back to Pop at end of the day...that comes to 2 hours and 15 minutes of your day going back and forth that could be spent enjoying park time...I'm 52 years old and can't even begin to describe how precious that 2 hours and 15 minutes of park time, strolling hand in hand with my wife, escaping the everyday of regular life, is to us. And 15 minutes is conservative at best, even if you drive and don't have to wait for buses or the monorail.
I am glad it works for you...it would never work for me.