What's the big deal with 4.3? I have a Nexus 7 and have used 4.2, 4.3 and 4.4 quite a bit. Each of those updates have been miner and bring little for day to day use. Sure you will get lock screen widgets but after a day the trill is gone. I have desk clock widget installed on my Nexus. It was a novelty at first. Now I just unlock the damn thing and don't pay any attention to widgets. There will be some minor performance enhancements and other under the hood things. For the most part you won't notice the difference. The settings menu will be categorized making it slower and harder to find stuff. At least to me that's not good.
I could understand the impatience if we were going from 4.0 to 4.1 as Google Now is amazing and is literately a life enhancing feature. However 4.2, 4.3 and 4.4 are minor updates. I guess I am less excited because I have seen 4.2, 4.3 and 4.4 and I don't see how they will change or enhance my use of the S3. I got my Nexus so I can have the latest version of Android and see the direction Google is going. I got the S3 because the hardware is awesome, exchangeable battery, and a great camera. The S3 still has all of that. I knew it would be slow to update and I am fine with that otherwise I would not have bought it.