I'm with you on that. It's a serious learning curve though and the difficulty for me is my serious lack of short term memory (dyslexia) which means that I constantly forget where I am on the board and how it's all routed. This is a lot better in the other Yamaha digital desk we have at Uni (OV1) because the user interface is better thought out - even though the rest of the desk is largely the same. I think it's probably mainly a Yamaha thing. They make great quality gear, but I've always found their user interfaces to be somewhat lacking. It was the same on the AW16 I used to use, lots of menus, lots of buttons that do one thing, then half of them only doing one thing very specifically. Difficult.
I do like using digital mixers, but my main experience is on the difficult Yamahas. I'd probably find it much easier on a Midas (for instance) where it all seems much more logical. And I love the flexibility, routing and connectivity (especially optical, which is really, really handy) - it is a lot of complication though and I wouldn't make a newbie sound man use one! I'm just about getting there with digital and I have a fair amount of experience.