Looks like it's a unanimous vote!
There is definately alot to be said for the "magic" of staying on-site. We've stayed off-site once and I just remembered one of the things I didn't like about it -- you have to go back into the real world every night when you leave Disney property. Maybe it's just me, but it seems to me when you stay on-site that magic feeling follows you everywhere.
Maybe a different way to pose the question would have been to ask if there are any off-site hotels that you would choose over POP? Vistana just happens to be one that I have heard of, but there are soooooo many hotels to chose from.