OK, I have joined the club and now am an iPhone user.
I am coming from many years using using a Palm Treo 650. It was getting rather dated as well as starting to move down the unsupported curve. It finally developed a crack on the face plate that killed the stylus capability.
I have found the iPhone to be rather easy to use — perhaps due to a lot of pre-purchase reading and video watching.
Off to the app store for the Omnifocus app, the multi-service IM client (BeeJiveIM), and this Tumbler client (Tumblrette) which I used to make this post.