There's a quick chart wizard? There's a quick chart wizard! The things I don't know about QlikView could fill a book.
It has no value to me, but I suspect it would be pretty useful to people who are new to the system. I do prefer your solution to the current wizard. Yours isn't so much a wizard, in the sense that everything is selectable at once, but that's my preference. Kind of like when I create a new chart, I pretty much hit "OK" before doing anything, and then fill everything in from the properties window instead. I'd prefer it just pop up the properties window directly rather than trying to make me build it step by step. Maybe that's in user preferences somewhere, but I didn't notice it.
Anyway, yeah, looks good.
I have a similar method when creating charts except I will probably go through the first 3 steps - to add expressions - and then hit OK before going back in to set the other properties. Very rarely go past the expressions step because I don't want to step through property pages that I don't want to change before I get to "Number".