For those of us who have (however reluctantly) signed up to the Adobe photographer package (both Photoshop and Lightroom for $10 a month - note that the special price ends today), is there a point in having both?

Now apart from photo processing, Lightroom also offers a file management environment and some nice printing stuff. If you want either of those things, it's a no-brainer. Read no further.

But what if you:

(a) don't intend to use the Lightroom walled garden file management interface (because you already have better and much faster and more flexible third-party alternatives), and
(b) don't print?

Given (a) and (b), is there any advantage to installing Lightroom? Does it offer anything that you don't already have in Photoshop?

(I am installing it right now to try out - why not? I've already paid for it - but I'm not sure what, if anything, I'd use it for. And, truth be told, I probably won't have the patience to play with it for very long if it doesn't seem to offer any immediate benefit.)