SW is on Side A of MCO...DME is on Side B. As long as you don't plan on getting your own checked bags, you'll be fine. Here's a breakdown of times...
gate to DME checkin area.....10-15 mins, depends on how quickly you get the tram and the size of the crowd you have to weave through.
at DME checkin...0-10 mins, but usually closer to 0 as long as you have your vouchers in hand and they are correct.
over to bus lines....2 mins, here they will scan your vouchers and ask about the number of bags you have.
in the bus line.....1-20 mins, depending on when the bus for your resort left prior to your arrival.
on the bus....0-20, depending on how many other guests are already on the bus.
ride to WDW....25-40 mins, depends on which number stop you are.
I have had times as short as 55 mins and once it was 85 mins. The vast majority of times it is in the area of 70-75 mins total.
Now...if you are planning on getting your own bags at baggage claim, you need to add another 25 mins or so. Why?? Because once you get off the tram at the main terminal, you have to go over to the Side A escalators and go down to level 2 (you arrived on level 1) and get your bags. Then, back up to level 1 of Side A, cross over to Side B and go down to level 3 (ground transportation and DME). It's a hassle to have to do that. I would strongly recommend tagging your checked bags and allowing DME to take care of them for you.
I usually like to allow 3 hrs total time before making an ADR. SO, if I arrive at the gate at 1:30pm, I won't make any ADRs before 4:30pm, more likely to be after 5pm.