Derek. I see you're a man who values time, so let's cut to the chase.
Yes. Online check in saves you time. Read on if you want to learn more.
By doing the motions on the front end and checking in within 10 days of arrival from home, you save yourself time by not having to wait in line to initiate the process once you arrive at your Disney resort. Instead, you can proceed to the designated online check in area, pick up a packet (which contains your Key to the World cards) and you're good to go.
You're likely coming from the airport. If you used Magical Express, the luggage you have on hand is likely minimal. So, if you're really hustling and have no need to stop by your room before heading to the parks, grab your packet from the online check in area in the lobby, check your carry-on luggage with bell services and proceed directly to the bus area to grab a ride to a theme park.
Go get 'em by visiting
mydisneyreservation.com.