Books are free at my library to order too.
I also have fond memories of visiting the library as a kid, mine had a huge fish pond and a wet area where you could glue and paint. Mum would sit with a brew and a slice of cake whilst I had fun. And I remember the move from the young kids section to the older kids with such delight - it was a proud moment in my life!
Not only do we borrow books from our library, we read to ds in there too.
Plus, I think it teaches kids about responsibility, we are borrowing these books therefore we must treat them well so that the next person can enjoy them too, plus, we have to take them back in time or we get a fine. All good lessons.
My ds as a toddler would fling his toys around the room, but never books or Mummy would get cross!