I've had the same experience as a lot of you...I go back to the iPhone and it's like, "Meh...this thing isn't nearly as cool (or fast) as it used to be..."
I look at the screen now and say "Wow, this thing's REALLY small, isn't it?" and I *NEVER* used to think that way.
There is, however, one thing the iPhone does better than the iPad (making phone calls doesn't count, since the iPad can't do it at all), and that's Skype.
Being able to hold the device to your ear like a telephone blows away the iPad. I'm sure Skype works fine on the iPad, but it's like using it on a laptop, and not as intuitive as on the phone 🙂