It's really not that bad. The things that are time consuming about moving are packing, disassembling, organizing, reassembling and so on. I own over 1000 books and live on the 5th floor of a building without an elevator, and even so, with 4 people it took us about 5-10 minutes to move the books in. Packing them into boxes took maybe 20 minutes.

Even though by weight it's much lighter the book shelves are a real pain in the ass.