Me too, since 2007, though I must admit, this year is the least compelling since 3G>3GS.
Interesting. To me this is far and away the best S upgrade yet.
I've always been contract free unlocked but always passed on the S upgrades. 4S and Siri didn't interest me in the slightest (I never use it even now, exceptionally poor in the UK ime, in all regards of voice recognition and functionality). At the time, I was happy with my 3G for two years (until it dropped off a cliff with iOS4 - fortunately I was always getting a launch 4) but this time around the 5S has me all in.
I always use a 6 digit passcode, 5 minute delay, and the prospect of kissing goodbye to that ballache is tremendous. The bonus is better camera, faster cpu/gpu and the M7 - which blatantly foreshadows an imminent Apple wearable (ie watch) - will get some interesting applications too. I'm a fitness freak, and the potential for use with fitbit type stuff is great going forward.
If it was just a speed bump, I wouldn't be the slightest bit interested as the 5 is still blazing in that regard, and the camera is brilliantly capable for a phone camera.