I now look forward to being told my iphone is awesomely fast and I must be doing something wrong.
I don't think anyone is saying that. It's just that other iOS 7 users on the same hardware (like me) are not experiencing the issues you are talking about. (e.g. I'm happily typing this reply and not seeing any keyboard lag at all - seems identical to iOS6 performance).
I do believe you are seeing issues, but I'm not.
Not sure why there is variation.
Question: did those with issues upgrade through iTunes or just over the air? And have you done a wipe and full restore via iTunes since the upgrade? That often sorts out glitches. I've always done that after every big upgrade.