Audio Book: Like Em Or Hate Em?

I have to say, I can not see the appeal of audio books. Something is lost when a book is read to me.

Why?

My mind wanders.

I have one Doctor Who novel in audio format.

It takes up 6 CDs!

I doubt I'll ever be able to listen to the whole book let alone remember what the book was about.

I've tried short audios, and I'm ok with them, especially if they have a great reader, like David Tennant.

He can read to me any time he wants.

What are your feelings on audio books?