You still may have to stand in line. However, your time at the window with the CM should be shorter. Our last 2 check-ins, doing online check-in, went like this.
CM: "Good morning and welcome to Caribbean Beach Resort! Can I see your ID?"
Me: "Good morning, here you go."
CM: "Thank you Mr. xxxx, here is your packet. You are in room xxxx, do you have any questions?"
Me: "No."
CM: "You're all set, have a Magical stay with us!"
Both times, the whole transaction took less than 2 minutes. We were on our way to our room as our ME bus was pulling away to it's next stop.
Also, both times we arrived at CBR around 10AM. With online check-in I noted what time we should be at the resort. Both times our room was ready.
We only ever have 2 requests when staying at CBR, Jamaica 45 and 2nd floor. Both times our requests were met even with checking in early.