The lesson isn't that iDevice's (or apple products) are amazingly intuitive -- it's that 2 year olds are quite smart and good at learning/playing/exploring.
Context is one thing (i.e., mouse, keyboard, MacPaint) and I agree that two year olds adapt to context amazingly.
Media is another thing entirely though. Context and media in intuitive ways will have far reaching ramifications.
Depending on which way you want to spin it, you could claim the ipad is better (omg! kid does less work and gets to sit back entertained!) or worse (omg! kid has lost the ability to actively create something, become a passive consumer instead!).