I would posit that the Grand's only advantage is its location. Sure the lobby is gorgeous, but you don't sleep there. The rooms are just as nice as any at a Hyatt or Marriott, albeit slightly themed. Having stayed at the Grand Floridian and other Deluxe resorts at WDW, there's no comparison - the rooms are much nicer and better themed at WDW's top tier resorts.
But the Grand offers you that private entrance to DCA and a short walk to DL. If location is tops for you, then stay there. Otherwise, I'd recommend off-site as well.
Ehhh....
I slightly disagree...
I'll repeat from my previous post: yes, the Grand Californian is expensive. There's no doubt about it.
As for the rooms being comparable to a Hyatt or Marriot, that is mostly true, except for the fact that the Hyatt and Marriot don't have the immersion that the GC has (Mickey soap, Resort TV, Mousekeeping, Pixie Dust all around...).
I'm having a tough time agreeing with the WDW/DLR resort hotel comparison though. I am an absolute WDW lifer. That said, I have a special place in my heart for DLR. I've stayed at Poly (albeit years back...
before they obliterated the poor fountain in the lobby) as well as Contemporary, Boardwalk (my favorite WDW resort), Beach Club and Yacht Club. I haven't stayed at Grand Floridian, although I visited my Grandparents years ago when they stayed there.
There's nothing that sticks out in my mind as being better about the WDW resorts than the GC. If anything, I have honestly been disappointed in several cases about the state of disrepair of some of the rooms at Deluxe resorts at WDW (goes along with the standard theme of WDW's semi-recent history...)
Anyhow, none of the WDW resorts put you overlooking DTD or the Parks, for that matter! I've watched the fireworks, Castle show, etc. from The Top of the World at Bay Lake Tower (as well as from The California Grille...and the original "Top of the World" before its name was changed to California Grille...).
No matter what, I just can't compare the experience of the Grand Californian to
anything that I've experienced at WDW. The reason that Boardwalk is my favorite WDW resort is because you're a short walk to Epcot or DHS (most importantly, Epcot - you can enjoy Illuminations and take a relaxing stroll back to the hotel without the need to get on a crowded bus to get back to your resort). But there are
no resorts that have a breezeway in the hotel that dumps you
into the Park!
At the end of the day, it's all personal preference. Everyone likes their own thing for a reason. I have always loved WDW, but if there's ever an opportunity to stay at Grand Californian, I'll take it!