I've moved Vista 64 to different hardware by simply booting in safe mode and having the OS re-detect all changes. And, I've done the same with Windows 7 64bits. Not just "plug and play" by definition, but not a problem either. Was I just luky?
And actually I've been doing stuff like this since Windows 2000, as I usually never reinstall windows for years, until I upgrade to a new OS; so when I get a newer machine every 1 or 2 years, I always try to avoid reinstallations as well.

I actually remembered having one problem once with a ACPI disk based installation moved to a non-ACPI older machine, but I found an easy workaround on line which consisted in having to change the disk configuration on the old machine before the move. Of course, that was not plug and play at all.