We used both Wi-Fi and hard-wired Internet connections during our WDW stay this summer. The clock started ticking from the moment we agreed to use the service and pay the fees. The clock continued ticking for the next 24 hours.
For Wi-Fi service at the GF, we had to enter our credit card number in the welcome screen. For some odd reason we couldn't get the Internet service to begin so we had to call the phone number that was stated. Whoever answered the phone took care of us immediately (it was a very quick phone call to a third-party service).
For the times when we used hard-wired connections at SSR, the charges appeared on our resort bill daily.
I should note that when we stayed at the Grand Californian in
Disneyland this summer, we did have Wi-Fi access in our room, but our room was directly across the courtyard from the concierge lounge where there was Wi-Fi service (no big deal since we brought our wireless router with us just in case we wanted to go wireless in our room -- we're geeks that way

).
I bring this up because my guess is that if you're in a WDW resort room that is right next to one of the concierge lounges (and quite a few of the lounges have Wi-Fi connections), you could ~probably~ get Wi-Fi in your resort room. However, this was not the case for us at the GF -- our concierge room overlooked the marina and Wi-Fi didn't reach that far (we were the very last room on the 3rd floor).
I'm thrilled to hear that the AKL
FINALLY has Internet service. They didn't have it when we stayed there in August and yet our Fort Wilderness cabin did (go campgrounds!).
I hope this helped.