If coming from POFQ it would be quicker to drive. If coming from a park you could use Disney transportation (boat or bus) to the Boardwalk - but if you want to go back to your resort after it would require boat & bus or bus & bus combo. Since you are staying at a Disney resort, you will be able to park at the Boardwalk. They may only give you a 3 hour pass or you may have to park in the lot across the street if it is during a busy time of year.
I'm not that impressed with the shopping at the BW as it has only a few shops. We have enjoyed eating at Flying Fish, Spoodles and ESPN. There is also a nice bakery, usually some strolling entertainers and our son's favorite: surrey bikes, which we pedal and he rings the bell! Across the lake at the Yacht/Beach club, you can rent mouse boats.
The BW is beautiful when lit up at night.
Tammy