Yes, I use bookmarks at paper books. No dogear, please
In fact, I collect them and it's my favorite travel gift for a group of friends who read a lot, like me. I used the normal bookmarks, but after I lost one I've bought at Prague while I was running to catch the bus, at the books I take out I only use bookmarks like this:
Magnetic bookmark. They're very popular now at the museums.
And I continue reading paper books, so I continue using them (but least than before). Indeed, not using them is what I miss when I'm reading at my ereader. And I usually have two or three books reading at the same time.
And about electronic reading, my ereader remembers where I'm reading at each book.