Yes. I find that I read far more on any ereader than I have done for a long time. I think it's because it's so easy to just pick one up where you left off for five minutes: if that were a book, somehow I would end up rereading the same paragraph five times, losing my bookmark, not being able to get comfortable etc.
There's a part of me that feels a bit sad that I find impediments to use in something as accessible and portable as a paperback. In public, I feel more comfortable with an ereading device, too: people might think I'm playing Angry Birds or checking Facebook, both of which are activities far more socially acceptable than reading these days.