I think one thing that has come out of this thread is the need to prioritize your DR plan.

If your documentation is stored on an intranet then  a DR plan stored on that intranet that puts restoring the intranet on day 2 is a bit of a chocolate fire guard.

The example of Amazon's e-mail going down illustrates a situation where there may be little impact on the customer (always a good thing).  In my case we lost e-mail for a day and this had a massive impact on our customers and we damn near lost a few.

It is very much horses for courses.