I've bookmarked your blog, it'll be interesting to see how you get on with the switch.
The reasons you cite for making the change, makes me think you will love the freedom an Android phone gives you to do what you want with YOUR phone...
I've got one or two iphone fanboy mates in work who refuse to try Android as they think they have the best now. They're wrong!
One was even (grudgingly) admiring the quality of a HD clip I'd [drag n dropped] onto my GS2 the other night off YT, and he was like..."Awww send me that...." but as we were in work and only on a 2G signal...I couldn't even email it to him. Just as we were laughing at the clip, another mate came in the breakroom and started watching over our shoulders. He was laughing at it too but he went in his pocket and got out his....GS2....and I just sent it over to him via Wi-Fi Direct.
My iphone buddy's face was a picture....but coz he's always been so anti-
anything-other-than-iphones, he'll never lose face and get something else - he would never be able to handle the amount of stick he'd get off everyone - he's one of those types who loves to dish it out, but can't take it back!!
Yes it'll be different to what you're used to, but you'll be expecting that no doubt, and once you find your feet with it (which be in next to no time) you'll love it.
Tip: don't just stick with the original Sammy Touch Whiz overlay that comes with the phone...there are a stack of alternatives, the one I use is Go Launcher (free off Google's equiv of the App store - Play Store)
Enjoy your new found freedom when it comes....
PS. When's it due to arrive?