The main problem with Disney Springs is that it is so far AWAY from the parks and most of the resorts. The bus ride from MK area to DS is sooo long. The bus ride from say Pop Century to DS (while closer) just isn't really convenient once you are back at your resort.
I only ever hit Disney Springs on my arrival day on the way INTO the WDW area (whether staying onsite or offsite). It's nice to get a fun Disney "hit" on your fist day as it is conveniently off the freeway. But once you are "in" the bubble or at your offsite condo/hotel) .. Getting in/out of Disney Springs is out of the way and no direct transport to the parks.
Imagine if it was on the land between MK and Epcot and on the monorail line!
I enjoyed CityWalk at Universal because of how it was attached and gave you some different options to eat on your way in or out of the parks. I am guessing
Disneyland is the same with Downtown Disney.
So while there is a lot of great options to eat and shop there (I mean World of Disney alone is worth it), it takes a lot of effort to GET there once your vacation has started.