Hands down my favourite restaurant. Personally, I really don't mind the queue (although I've never lined up during the winter time) and the cramped space. It gives the restaurant an unique feel.
We always get seated at the bar since we're always a party of two and it's amazing to see the staff cooking so efficiently. There is practically no waiting once you're seated. The chef/boss is also very friendly.
The food at Kazu is out of this world, definitely worth the queue in my opinion. I've tried a lot of their dishes and have never been disappointed: everything is so flavourful. The portions are huge so you are getting the bang for your buck (most dishes are pretty inexpensive as well).