Strange how different this process is in different areas of the country. I can't tell you why this is so, could be many things I guess, but my wife's and my experience here in Skagit County (northwestern Washington state) could hardly be more different.
Skagit County announced its program for seniors about 2 weeks ago. Sign ups were announced to begin on Jan 19th, and vaccinations on Jan 26th. Being 75 years old, I was selfishly disappointed when our Governor (Insley) announced on Jan 25th that the eligible senior group age would immediately drop from 70 to 65. I figured, crap, an even bigger line now! Well, I signed up on that first day (1/19), and easily got appointments for the first day of vaccinations (1/26). When we got there, there were no lines and lots of volunteers to assist you at every step (where to park, where to go, how to sign in, where to wait, who to go to to get the shot, a little sticker that gave you the clock time of when your mandatory 15 wait for adverse reactions was up, how to drive out of the fairgrounds). I'm nearly positive there were more volunteers than patients. There was no wait at any stage whatsoever. We were one of the last to be vaccinated that day, and it was clear to me that plenty of ready-to-go shots in their syringes were still available.
And here's the kicker......when you signed up on the well designed, well functioning Skagit County website, there was a little counter at the bottom of the screen where you input all your personal data that displays in realtime the number of still available appointment slots. You can actually watch the number of available slots count down as you fill in the blanks on that web page.