I'm assuming you have very few live tiles then if you have every possible amount of information you want to glance at on your main screen. You don't scroll at all? That said, I'm pretty positive I can handle a quick swipe.
I have live tiles for weather, email, texts, calendar. Those are the most important to my every day life. I only scroll to see the calendar (it's just below the immediate window) because once I see it I'm usually good for the day. I do scroll down to get to the other tiles that access apps (except phone and contacts shortcuts, they are at the top). But there's no lag with the scrolling. And remember, the screen on my Nokia is bigger than your iPhone so the screen can display more info.
All in all it works great for me. As I said, I do miss some shortcut tiles but then these days I don't turn off wifi or Bluetooth at all. The only one that really makes a difference is airplane mode so I have a shortcut to the option. I do wish for a live tile for a clock. My eyes aren't what they used to be and the tiny clock requires me to put on my reading glasses. Hopefully MS will open up the API to everyone. Right now only HTC has the option. All that exclusivity junk. HTC has some exclusive things and Nokia has others.
I think it will work out in the end. Otherwise I may move back to Android. Or maybe iPhone if Apple delivers. Who knows.