The BoardWalk is great for a few reasons. You are a short walk to EPCOT and a slightly longer walk to MGM, which helps if the boats are taking awhile. The BoardWalk itself is full of restaurants, shops, and entertainment, and its nice to not have to travel for that. The rooms are just as nice (or nicer!) as some of the MK area Deluxes but not as high in cost- this is the main reason why we switched around 6 years ago to the Boardwalk from the Grand Floridian. Still, it does lack the "Disney essence" (or Magic) that perhaps some of the monorail resorts (namely the GF) contain. The theme is genius of the Jersey boardwalk and is well executed down the seagull sounds, but I could use a Mickey Mouse or more to remind me I'm in disney. I also think the monorail is a great and easy mode of transportation compared to the buses, and if you can chop it down to only 2 bus rides to parks (if going from an MK resort) it makes them a little better.
If you know you want to stay Deluxe but don't know where: I think its also a question of preferences- my family loves the central location of EPCOT on the WDW grounds, but they also name EPCOT as their favorite park. I have different preferences than my family- I love the MK and would rather stay near there, for the magic and for the daily castle view of course, so I'd rather stay in that area and have access to the monorail. sure EPCOT is central, but the buses, boats, and walking do not make the Boardwalk as ideal as the monorail option in my opinion.
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espnerica
My Previous Trips WDW Yearly Visit 1986-2009 plus 6 additional visits at various other times for 28 total visit. Have stayed at Polynesian, Contemporary, Grand Floridian, Yacht Club, Boardwalk. Most Recent Trip: WDW December 2008 Boardwalk. DLP 1995, DLC Summer 2001. Next Trip: April 2009, All-Star Music.