Ignoring the whiners, fanroids and Apple haters. Apple did this for a reason: to maximise revenue. If this encourages people to buy more stuff more quickly it stays otherwise it will change to something else. The "it's all different" whining is just like people complaining when Google tweaks their results presentation and suddenly a carefully SEO'd site is no longer on page 1.

Personally I never use the iPhone interface to the appstore, I hated the way it used to be, and I hate this.

However, Apple have announced an iTunes revamp for next month, I suspect this is a preview of what that will be like.